Year % of total population 1960 55.49210728560993 1961 54.792661926256585 1962 54.1326314815074 1963 53.465079107744394 1964 52.7903061455167 1965 52.118869966580824 1966 51.49460372127961 1967 50.932193541767504 1968 50.36149606012307 1969 49.78484708615436 1970 49.21972381323613 1971 48.57334382657995 1972 47.85353100907268 1973 47.13404166812709 1974 46.414569946035655 1975 45.7055338192027 1976 45.007745540330156 1977 44.294932265398 1978 43.56572364021033 1979 42.89594206500064 1980 42.293875477303104 1981 41.836046137823686 1982 41.44136748219027 1983 41.044655114533825 1984 40.647422266912045 1985 40.25329214468656 1986 39.86889049752492 1987 39.490332679468075 1988 39.10827261499435 1989 38.81686071133062 1990 38.60815108949244 1991 38.396687630601136 1992 38.30658066693044 1993 38.334761348438434 1994 38.363246398484286 1995 38.39076938744021 1996 38.41275234244655 1997 38.43682205569551 1998 38.46598176647503 1999 38.49493021140077 2000 38.52381264250171 2001 38.5045466989001 2002 38.4442392528008 2003 38.39784430800758 2004 38.35181895094216 2005 38.29730777580951 2006 38.23610455447292 2007 38.1581545712329 2008 38.075459453379516 2009 38.013953123991094 2010 37.97393497558025 2011 37.93606551476866 2012 37.918223026113225 2013 37.903186263320634 2014 37.88635485722618 2015 37.859327541791814 2016 37.81551567700684 2017 37.75154527073651 2018 37.66633339641536 2019 37.56186078689777 2020 37.43854575689299 2021 37.31000352980826 2022 37.16025195894421 2023 36.96531684036265