Year % of total population 1960 55.1799438036463 1961 54.7669635529688 1962 54.2967110558099 1963 53.7576466202362 1964 53.1970189637576 1965 52.7522989134101 1966 52.4208069508454 1967 52.1341021703225 1968 51.9103454123663 1969 51.7501970322285 1970 51.6404958933446 1971 51.5596267655963 1972 51.4902229430513 1973 51.4219195534793 1974 51.3448661022345 1975 51.2559099544344 1976 51.1454782477723 1977 51.0078751777617 1978 50.8444056199533 1979 50.661065059741 1980 50.4812260909822 1981 50.2858850453644 1982 50.0285978962898 1983 49.756905689516 1984 49.533793955935 1985 49.3682949554106 1986 49.2656734046852 1987 49.2232685584706 1988 49.2348729811956 1989 49.292990199817 1990 49.3668801421417 1991 49.4164290704694 1992 49.4382320120003 1993 49.4565287772113 1994 49.5194607569298 1995 49.6513253975883 1996 49.841033811294 1997 50.0813808206592 1998 50.3662112687248 1999 50.4445396324582 2000 50.2718639236527 2001 50.069832274743 2002 49.8848039610265 2003 50.0330626348377 2004 50.5457680285845 2005 51.0906336102098 2006 51.6064879704626 2007 52.1208073600319 2008 52.6489369222814 2009 53.1925639656775 2010 53.7394973354633 2011 54.2702596219353 2012 54.7738120889194 2013 55.2395114331366 2014 55.6561462723828 2015 56.0232561483562 2016 56.3521800190825 2017 56.6291041719183 2018 56.8248523309204 2019 56.9915902430637 2020 57.1953543066812 2021 57.4328571837169 2022 57.6865185142694 2023 57.9431388082035