Year % of total population 1960 58.751 1961 58.147 1962 57.506 1963 56.863 1964 56.216 1965 55.569 1966 54.92 1967 54.268 1968 53.615 1969 52.962 1970 52.36 1971 52.081 1972 51.801 1973 51.521 1974 51.241 1975 50.962 1976 50.681 1977 50.402 1978 50.121 1979 49.841 1980 49.553 1981 49.214 1982 48.874 1983 48.535 1984 48.195 1985 47.857 1986 47.518 1987 47.18 1988 46.841 1989 46.503 1990 46.097 1991 45.243 1992 44.391 1993 43.544 1994 42.699 1995 41.859 1996 41.022 1997 40.193 1998 39.368 1999 38.549 2000 37.802 2001 37.503 2002 37.206 2003 36.909 2004 36.613 2005 36.318 2006 36.024 2007 35.732 2008 35.44 2009 35.149 2010 34.86 2011 34.563 2012 34.259 2013 33.94799999999999 2014 33.629000000000005 2015 33.304 2016 32.973 2017 32.635000000000005 2018 32.291 2019 31.941000000000003 2020 31.586 2021 31.224999999999994 2022 30.858999999999995 2023 30.488