Year % of total population 1960 54.95183602008053 1961 54.21266491704241 1962 53.49776832747816 1963 52.7824392938027 1964 52.06603653838548 1965 51.33665453289616 1966 50.62702521407181 1967 49.930727296928254 1968 49.23321700746005 1969 48.53634071171889 1970 47.84897618440688 1971 47.18371979963987 1972 46.53249035981718 1973 45.88614350701356 1974 45.24572305284493 1975 44.6289008338109 1976 44.031843706681556 1977 43.446140208995686 1978 42.858926061045274 1979 42.349648233635435 1980 41.92578537385489 1981 41.40810052199612 1982 40.86078821175406 1983 40.31583047342118 1984 39.76271236188216 1985 39.22443503818984 1986 38.731729289095426 1987 38.262027938132604 1988 37.7943332864306 1989 37.453421725428825 1990 37.26081144183779 1991 37.11741491423125 1992 37.01770670655174 1993 36.94331931088979 1994 36.870924120900916 1995 36.795659963027944 1996 36.7358639531967 1997 36.672741336772674 1998 36.5995104128593 1999 36.517662277314734 2000 36.42839686535838 2001 36.315095928847896 2002 36.1802368904288 2003 36.02849085318441 2004 35.86767533143449 2005 35.70166257602227 2006 35.53392706394435 2007 35.360174920069525 2008 35.18372875623248 2009 35.010633340481334 2010 34.84876456678706 2011 34.70367765756523 2012 34.56944775811047 2013 34.436249957144334 2014 34.300372852728344 2015 34.15783513455539 2016 34.00661372048979 2017 33.84782179680699 2018 33.6800194661882 2019 33.50287578092351 2020 33.32563219219276 2021 33.14658027148009 2022 32.98830482222057 2023 32.79772169875532