Year % of total population 1960 41.3666497065528 1961 41.4737676207766 1962 41.6619177064272 1963 42.0477908136257 1964 42.607018126818 1965 43.1304757855029 1966 43.5862806822624 1967 44.0322711587571 1968 44.4683618380901 1969 44.8966368239586 1970 45.3176788784138 1971 45.7316927106207 1972 46.1472787746542 1973 46.5650101736556 1974 46.7900794513142 1975 46.8346133007789 1976 46.8456377467749 1977 46.8102719702952 1978 46.7782525335524 1979 46.7905259868937 1980 46.8736424554431 1981 46.9999739685987 1982 47.1382556715033 1983 47.2936194692873 1984 47.469953228072 1985 47.3866806671305 1986 46.9462477107726 1987 46.3312204222061 1988 45.5830637913607 1989 44.7460320053587 1990 43.8536544411863 1991 42.9244976880909 1992 41.9645859227721 1993 40.9904250656895 1994 40.4069878479647 1995 40.1181356412749 1996 39.690573305013 1997 39.1514160211045 1998 38.5329994628742 1999 37.8704272247687 2000 37.1819216650418 2001 36.4729843743519 2002 35.7577209907314 2003 35.0294456325053 2004 34.030734895326 2005 32.7701026402756 2006 31.5293639367668 2007 30.3900429078476 2008 29.4088124665578 2009 28.6276703526217 2010 26.9145042297403 2011 24.6852538456501 2012 23.0205325663113 2013 22.148320005869 2014 22.1506671729936 2015 22.2671223048271 2016 22.1570370639849 2017 22.3460837798837 2018 23.0097150575078 2019 24.0896021698248 2020 25.6434693104732 2021 26.7695667110794 2022 27.0268784943638 2023 27.0029459235068