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 early twentieth century, quantum theory has proved to be successful in describing accurately the physical reality of the mesoscopic and microscopic world, in multiple reproducible physics experiments.

Since the early years of the twentieth century, absolute dating methods, such as radiometric dating ( including potassium / argon, argon / argon, uranium series, and, for very recent fossils, radiocarbon dating ) have been used to verify the relative ages obtained by fossils and to provide absolute ages for many fossils.

Since around the start of the twentieth century, Haeckel's " biogenetic law " has been refuted on many fronts.

Since the second half of the twentieth century the associations of race with the ideologies and theories that grew out of the work of 19th-century anthropologists and physiologists has led to the use of the word race itself becoming problematic.

Since the latter part of the twentieth century, it has been questioned whether a diet high in sugars, especially refined sugars, is bad for health.

Since the first class graduated, SAMS planners have supported every major military campaign, providing " the Army with many of its top campaign planners for the late twentieth and early twenty-first centuries ".

Since the early twentieth century when astronomer Edwin Hubble first hypothesized that redshift shows the universe is expanding, prevailing scientific opinion has been that the current state of the universe is the result of a process described by the Big Bang.

Since the early twentieth century, the philosophy done in universities ( especially in the English-speaking parts of the world ) has become much more analytic.

Since the late twentieth century, they have developed the successful North Star Mohican Resort and Casino to generate revenues for the tribe.

Since the late twentieth century, they have developed the North Star Mohican Resort and Casino on their reservation, which has successfully generated funds for tribal welfare and economic development.

Since this was the heart of artistic Paris at the turn of the twentieth century, there was much discussion at the cabaret about " the meaning of art ".

Since the US Federal Reserve was formed in 1913, however, the US dollar has fallen to barely a twentieth of its former value through the consistently inflationary policies of the bank.

Since the early twentieth century, the topsails and topgallants are often split into a lower and an upper sail to allow them to be more easily handled.

Since the late twentieth century, both the state and the United States have improved respect of indigenous rights and tribal sovereignty, but conflicts between the Tongva and the rapidly expanding population of Los Angeles have often required resolution in the courts.

Since the end of the twentieth century, there has been a resurgence of interest in his music.

Since the twentieth century, the island has been redeveloped for use as a tourist destination and resorts, although some private plantations remain.

Since the late twentieth century, the rank of general is usually the highest active rank of a military not at war.

Since the advent of modern drainage in the nineteenth and twentieth centuries, the Fens have been radically transformed, so that today arable farming has almost entirely replaced pastoral and the economy of the Fens is heavily invested in the production of crops such as grains, vegetables and some cash crops such as rapeseed or canola.

Since December 2010, UFO had been working on a twentieth studio album, which was supposed to be released in June 2011.

Since the late twentieth century, unrelated contemporary artists have contributed individual reworkings of tunes to tribute albums for well established artists who are considered to be influential and inspiring.

Since there was no linguistic contact with France from the late eighteenth century until the twentieth century, Acadian French retained features that died out during the French standardization efforts of the nineteenth century.

Since the twentieth century, competition law has become global.

Since that time better measurements have placed the star further away but it was the still the second-closest known star system until the discovery of two dim red dwarf stars, Wolf 359 and Barnard's Star, in the early twentieth century using astrophotography.

Since the twentieth century a number of magical practitioners, including adherents of the Neopagan religion of Wicca, have begun to utilise the concept of familiars, due to their association with older forms of magic.