Since 1977, New Zealand has celebrated Arbor Day on June 5, which is also World Environment Day, prior to then Arbor Day, in New Zealand, was celebrated on August 4 – which is rather late in the year for tree planting in New Zealand hence the date change.

Since the late 1930s alloy steels have been used for frame and fork tubes in higher quality machines.

Since the late 1980s, evidence has become available that instillation of BCG into the bladder is an effective form of immunotherapy in this disease.

Since its introduction at games by the " Roar from 34 ", led by Wild Bill Hagy and others, in the late 1970s, it has been a tradition at Orioles games for fans to yell out the " Oh " in the line " Oh, say does that Star-Spangled Banner yet wave " in " The Star-Spangled Banner ".

Since the late nineteenth century, the South used a colloquial term, the one-drop rule, to classify as black a person of any known African ancestry.

Since the late nineteenth century, only two brief periods of violence have marred its democratic development.

Since there is no evidence that late Maastrichtian nonavian dinosaurs could burrow, swim or dive, they were unable to shelter themselves from the worst parts of any environmental stress that occurred at the K – T boundary.

Since the late 1990s, Orange has also been working in conjunction with singer / songwriter Craig Deanto, and they have released an album titled Who Hears the Cries.

Since 2000Actually the most important are: Cable Onda ( 40 % share ), Cable and Wireless ( started on late 2009 ) and CTV.

Since these geographic considerations imply that, not including the hill within, the walls would be willfully making the city prone to attack from it, some scholars, including the late 19th century surveyors of the Palestine Exploration Fund, consider it unlikely that a wall would ever have been built that would cut the hill off from the city in the valley ; archaeological evidence for the existence of an earlier city wall in such a location has never been found.

Since the late 1990s, custom dog tags have become fashionable amongst musicians ( particularly rappers ), and as a marketing giveaway item.

Since the late 1980s, prominent individuals and organizations have recognized the seminal importance of Engelbart's contributions.

Since the late 1990s, Dublin has experienced a significant level of net immigration, with the greatest numbers coming from the European Union, especially the United Kingdom, Poland and Lithuania.

Since the late 19th century, differential geometry has grown into a field concerned more generally with the geometric structures on differentiable manifolds.

Since then McLean has stated that the lyrics are also somewhat autobiographical and present an abstract story of his life from the mid-1950s until the time he wrote the song in the late 1960s.

Since the late 1980s, the field has been revived in the wake of progress made in the related fields of psycholinguistics, neurolinguistics, evolutionary anthropology, evolutionary psychology, and cognitive science.

Since the late ' 60s, the exploitation of oil increased production and reserves are estimated at 4. 036 million barrels

Since its acquisition of Verant in late 1999, SOE develops, runs, and distributes EverQuest.

Since the late 1990s, almost all release prints have used polyester film stock.

Since the late 1990s, bzip2, a file compression utility based on a block-sorting algorithm, has gained some popularity as a gzip replacement.

Since the late 1970s, towns in the north began industrial production through maquiladoras, especially in San Pedro Sula and Puerto Cortés.

Since the late 1980s, Indonesia has made significant changes to its regulatory framework to encourage economic growth.

* interface to personal computers: Since the late 1990s, most pumps can interface with personal computers for managing and documenting pump programming and / or to upload data from the pump.

Since the late 1990s, the Jamaican government has set an agenda to push the development of technology in Jamaica.

Since the late Middle Ages the Kingdoms of England and Scotland had been evolving towards a quasi-oligarchical or collegiate form of government in which the monarch was held to rule with the consensus of the land-owning upper classes.

Since the 20th century, the appointment of Archbishops of Canterbury conventionally alternates between more moderate Anglo-Catholics and Evangelicals.

Since the early 20th century, the armed forces have pursued the goal of weapons self-sufficiency.

Since the early 20th century it has been commonly accepted that Old Irish Bel ( l ) taine is derived from a Common Celtic * belo-te ( p ) niâ, meaning " bright fire " ( where the element * belo-might be cognate with the English word bale in ' bale-fire ' meaning ' white ' or ' shining '; compare Anglo-Saxon bael, and Lithuanian / Latvian baltas / balts, found in the name of the Baltic ; in Slavic languages byelo or beloye also means ' white ', as in Беларусь ( White Russia or Belarus ) or Бе ́ лое мо ́ ре Sea ).

Since the second half of the 20th century most scholars have agreed with Martin Noth's thesis that the books of Deuteronomy, Joshua, Judges, Samuel and Kings form parts of a single work.

Since the Anglo-Boer war the term " Boervolk " was rarely used in the 20th century by the various regimes because of this attempt to assimilate the Boervolk with the Afrikaners.

Since the second half of the 20th century, computers have been programmed to play chess with increasing success, to the point where home computers can play chess at a very high level.

Since the consolidation of newspaper comics by the first quarter of the 20th century, most cartoonists have used a group of assistants ( with usually one of them credited ).

Since the 20th century, another source of words has been Japanese using existing kanji ( Chinese characters used in Japanese ).

Since the later 20th century, use of CE and BCE has been popularized in academic and scientific publications, and more generally by publishers emphasizing secularism or sensitivity to non-Christians.

Since the early 20th century, the term is used almost exclusively in conjunction with the modern development of hydro-electric power, which allowed use of distant energy sources.

Since the early 20th century, certain logicians have proposed logics that deny the validity of the law.

Since the early 20th century, a form of standardized Mandarin ( described above ) has been the official and de facto national standard language in China and it is today one of the most frequently used varieties of Chinese among Chinese diaspora communities internationally.

Since the early 20th century, musical theatre stage works have generally been called, simply, musicals.

Since the mid 20th century, computers calculate the required functions instead.

Since the start of the 20th century, complexity of total syntheses has been increasing, with examples such as lysergic acid and vitamin B12.

Since the 20th century, the work of physics research has been divided between theorists and experimentalists ( see scientific method ).

Since the 20th century, the term republicanism is more likely to refer to the policies of the Republican Party, the nation's right-wing political party, than to republican values generally.

Since the 18th century, particularly during the late 19th and early 20th centuries, some wealthy or ennobled families embraced Catholicism, including branches of the Asquith, Bellingham ( Ireland ), Bowyer ( England ), Calvert ( Maryland ), Cary-Elwes / Elwes ( since 1872 ), Feilding ( England ), Forbes ( Ireland ), Leslie ( Ireland ), Fraser ( Scotland ), Lane-Fox, Meynell, Noel ( Gainsborough ), Ashton Case ( or Ashton-Case ; England ), Radcliffe ( England ), Monckton, Pakenham ( Ireland ), Pontifex ( England ), Crichton-Stuart ( Scotland ) and Strickland ( Counts of Catena, Malta ) families.

Since the resettlement of Svalbard in the early 20th century, coal mining has been the dominant commercial activity.

Since the 20th century, Western legal systems have generally allowed for " greater women's rights " than Islamic law.

Since the first widespread promotion of t ' ai chi ch ' uan's health benefits by Yang Shaohou, Yang Chengfu, Wu Chien-ch ' uan, and Sun Lutang in the early 20th century, it has developed a worldwide following among people with little or no interest in martial training, for its benefit to health and health maintenance.

Since then, several V: TES expansions have been released, and the game was the only official source of material for the Old World of Darkness, until 2011 when the 20th Anniversary Edition of Vampire: The Masquerade was published and the Onyx Path was announced.

Since the end of the 20th century, the economic strength during the 1920s has drawn close comparison with the 1950s and 1990s, especially in the United States of America.

Since the latter half of the 20th century Artois has suffered along with similar areas because of the decline of the coal industry.

Since the turn of the 20th century phonics has been widely used in primary education and in teaching literacy throughout the English-speaking world.