Since independence from Portugal in 1975, a number of Angolan students continued to be admitted every year at high schools, polytechnical institutes, and universities in Portugal, Brazil and Cuba through bilateral agreements ; in general, these students belong to the Angolan elites.

Since 1975, Niger has celebrated Arbor Day as part of its Independence Day: 3 August.

Since the independence in 1975 the official statistics in Cape Verde have no longer made statistics based on racial groups.

Since after independence from Portugal in 1975, a number of Cape Verdean students continued to be admitted every year at Portuguese high schools, polytechnical institutes and universities, through bilateral agreements between the Portuguese Government and the Cape Verdean Government.

Since these first accounts, Bulgarian authorities had organized several population censuses: 1892, 1900, 1905, 1910, 1920, 1926, 1934, 1946, 1956, 1965, 1975, 1985, 1992, 2001 and 2011.

Since the end of the Angolan Civil War ( 1975 – 2002 ), stability has been widespread in the country, and major reconstruction has been going on since 2002 in those parts of the country which have been damaged by the civil war.

Since 1975 it is in a formal covenant partnership with the Waldensian Church.

Since 1975, practically all the gains in household income have gone to the top 20 % of households ...

Since 1975, the highlands have provided an area in which to relocate people from the densely populated lowlands.

Since 1975, when a Worldcon site outside North America is selected, WSFS administers a parallel selection process for NASFiC, voted on by WSFS members at the following year's Worldcon, ( if there is no NASFiC in that year ), or by the following year's NASFiC, if there is one.

Since the Madrid Accords of 1975, part of Western Sahara have been administered by Morocco as the Southern Provinces.

Since 1975, Blatter has been working at FIFA, first as Technical Director ( 1975 – 1981 ), then General Secretary ( 1981 – 1998 ), before his election as FIFA President in 1998.

Since 1975, she is one of four women who have been the year-end World No. 1 at least four times ( 1998, 2001, 2004, and 2005 ); the others are Chris Evert, Steffi Graf and Martina Navratilova.

Since 1975, however, those powers have not been exercised.

Since 1975 the party system is dominated by the social democratic Socialist Party and the liberal conservative Social Democratic Party.

Since 1975, investments grew by 10 % in the past year and had been targeted for development.

Since 1975 it has been entitled The Garden and is currently a monthly publication.

Since 1975, the last stage of the Tour de France has finished on the Champs-Élysées, with riders typically making six to eight circuits back and forth on the avenue, with a furious final sprint.

Additionally, a 60 Minutes television episode titled " Ever Since Icarus " ( airdate August 31, 1975 on CBS ) addressed the renaissance of human flying with hang gliders.

Since 1973, Bracknell Forest has been twinned with Opladen in Germany, continued by Leverkusen after Opladen's incorporation in 1975.

Since 1 January 1975, Duisburg has been divided into seven districts or boroughs ( Stadtbezirk ) from the north to the south:

Since 1975, an excursion steamboat at New Orleans has also borne the name Natchez.

Since its founding in 1975, the National Italian American Foundation ( NIAF ) has worked closely with the bicameral and bipartisan Italian American Congressional Delegation, which is led by co-chairs Rep. Bill Pascrell of New Jersey and Rep. Pat Tiberi of Ohio.

Since one DSL termination point can support multiple ISPs, the economic feasibility of DSL is substantially improved.

Since being liberalized in 1991, the Colombian telecommunications sector has added new services, expanded coverage, improved efficiency, and lowered costs.

Since then, relations have improved.

Since esterification is highly reversible, the yield of the ester can be improved using Le Chatelier's principle:

Since the original ratification of H. 263 in March 1996 ( approving a document that was produced in November 1995 ), there have been two subsequent additions which improved on the original codec by additional optional annexes ( extensions ).

Since the institution of a democratic form of government in 2002, Mali's relations with the West in general and the United States in particular have improved significantly.

Since the 1994 crisis, administrations have improved the country's macroeconomic fundamentals.

Since that time, the original principles of textual criticism have been improved and applied to other widely-distributed texts such as the Bible.

Since then, with improved environmental standards, light-coloured peppered moths have again become common, and the dramatic change in the peppered moth's population has remained a subject of much interest and study.

Since the event relations have improved.

Since then, the two countries have had significantly an improved relationship.

Since some of the outward drift is compensated by an inward drift on the same flux surface, there is a macroscopic equilibrium with much improved confinement.

Since that time aircraft capabilities had improved considerably, and existing weapons were unlikely to have any effect on a raid.

Since that time the United States luge program has greatly improved.

Since the 2000s, the latter has significantly improved as main roadways have been upgraded to near European standards.

Since that time, cultivation of poorer varieties has been reduced and new technologies and methods have improved the quality considerably.

Since many of the same genetic mechanisms involved in determining sexually dimorphic traits have been preserved during evolution to this day in fruitflies, mice, and humans, understanding how these genetic mechanisms work can lead to improved healthcare that takes into account sex differences.

Since all of these choices are Pareto-optimal-no one's welfare can be improved without reducing the welfare of others-choice 4 would not be chosen, since there would always be other preferred choices.

Since the first CT scanner, CT technology has vastly improved.

Since collective societal welfare is improved, but the providers have no way of monetizing the benefit, less of the good will be produced than would be optimal for society as a whole.

Since the return of civilian rule to Argentina in 1983, relations with Chile, the United Kingdom and the international community in general improved and Argentine officials have since publicly ruled out interpreting neighboring countries ' policies as any potential threat ; but Argentina still does not enjoy the full trust of the Chilean political class.

Since the election of Dean Barrow in 2008, however, relations with Israel have improved considerably.

Since the election of Pyotr Pimashkov as the mayor of Krasnoyarsk in 1996, the appearance of the city gradually improved: the old historical buildings were restored, the asphalt walkways were replaced with paving-stone, and numerous squares and recreation areas with fountains were either restored or constructed from scratch.

Since the launch of SNA IBM has introduced improved communications processors, of which the latest is the 3745.