Year % of total population 1960 43.0164932297648 1961 43.535515747485 1962 43.9426256522326 1963 44.2615176670252 1964 44.3537340600445 1965 44.2598045666308 1966 44.1795209991063 1967 44.1314096783222 1968 44.092882083574 1969 44.0402854387849 1970 43.9490391903888 1971 43.8201377636722 1972 43.6384643991045 1973 43.4014581676048 1974 43.1587256071649 1975 42.9531455200434 1976 42.8786161378901 1977 42.9029260436179 1978 42.9658489032277 1979 43.1116003104205 1980 43.3140100685439 1981 43.0272143654409 1982 42.8414321119303 1983 43.1812943156348 1984 43.4744126753068 1985 43.7238994692619 1986 43.9210688509534 1987 44.0537205763649 1988 44.1222549907225 1989 44.0850645625323 1990 43.537248670453 1991 42.8664493692914 1992 42.4978435968891 1993 42.4026335347265 1994 42.0245852229384 1995 40.9985192979223 1996 39.7443392117862 1997 38.2389306621226 1998 36.5506289246186 1999 34.8207110770327 2000 33.0879827878461 2001 31.399740960801 2002 29.9416134953589 2003 28.5624788066532 2004 27.158719558704 2005 25.880950808693 2006 24.7265727136868 2007 23.7474814596304 2008 22.9999890818666 2009 22.5125721878359 2010 22.2626075049498 2011 22.2140549127961 2012 22.3338740549222 2013 22.5529625038527 2014 22.9660780479928 2015 23.4693260060092 2016 23.7873690611892 2017 23.9748862898195 2018 24.1061413311442 2019 24.1061946137966 2020 23.9924771617384 2021 23.8111182704338 2022 23.5657110959308 2023 23.2537950740051