Year % of total population 1960 49.0421877147176 1961 48.2012415546858 1962 47.2131728830087 1963 46.3179587831207 1964 45.5354504527994 1965 44.8714587542217 1966 44.29427375448 1967 43.7703745894785 1968 43.3166347745695 1969 42.9403829042165 1970 41.660240494208 1971 39.8013463965859 1972 38.3219404333347 1973 37.1205736132996 1974 36.1318244942805 1975 35.3122132042678 1976 34.6248637376179 1977 34.0421785656118 1978 33.5475979378058 1979 33.1296472684815 1980 32.7810416291224 1981 32.4910898072821 1982 32.2477351827209 1983 32.0389524714484 1984 31.8520794507252 1985 31.6767249390491 1986 31.6796049465381 1987 31.8822016603295 1988 32.1056820222156 1989 32.3081031445598 1990 32.4940284145582 1991 32.6656239183677 1992 32.8250154362573 1993 32.976230400316 1994 33.1183603198032 1995 33.2518009912003 1996 33.3796869243196 1997 33.354159439584 1998 33.1705671457856 1999 32.9915767435945 2000 32.83942551673 2001 32.7084355310821 2002 32.6229062264262 2003 32.5623058682075 2004 32.80921609938 2005 31.7342790823721 2006 28.3199022717869 2007 25.2077899622776 2008 23.5675012480293 2009 23.3942173816382 2010 24.2507166601304 2011 25.1246140194028 2012 25.7371724232025 2013 25.9494345618106 2014 25.407175096468 2015 24.7410618771932 2016 24.6472094655987 2017 25.0839401052086 2018 25.7392837470344 2019 26.7629535824397 2020 27.3510398006075 2021 27.325029247815 2022 27.4899985974661 2023 27.6821709393088