Year % of total population 1960 48.0974773034018 1961 48.1217338265041 1962 48.1434630323214 1963 48.1571380173726 1964 48.166525215165 1965 48.173670775835 1966 48.1791225687755 1967 48.1873677148743 1968 48.1952867672947 1969 48.200392221235 1970 48.1827106923025 1971 48.3688301854253 1972 48.5652851134023 1973 48.5500040213751 1974 48.5343212579372 1975 48.5512402921298 1976 48.6036490142456 1977 48.6511507082847 1978 48.6905710773546 1979 48.7270064245499 1980 48.7558269703245 1981 48.7709488530626 1982 48.7726803950018 1983 48.7679640717576 1984 48.7659508300484 1985 48.7718282973874 1986 48.7792808728564 1987 48.7854225388778 1988 48.7914055854545 1989 48.7901300892559 1990 48.7797254650034 1991 48.7717857996983 1992 48.7798540913696 1993 48.7971747036515 1994 48.8142690892646 1995 48.8383697896395 1996 48.8640919447445 1997 48.8940047849861 1998 48.9321741290389 1999 48.9674854504946 2000 49.0040534369085 2001 49.0522583633854 2002 49.1167753564851 2003 49.1965448782207 2004 49.2813081083632 2005 49.3743759872698 2006 49.4986031260398 2007 49.6312050817251 2008 49.7757117013614 2009 49.9076041527997 2010 49.9878345161836 2011 50.046480948583 2012 50.0964967280796 2013 50.1480687490648 2014 50.1968959619912 2015 50.2402566052081 2016 50.2709222833084 2017 50.2933057502689 2018 50.3222148379379 2019 50.3588361266487 2020 50.3863079836406 2021 50.4015426038216 2022 50.4287566769626 2023 50.4653983228947