Year % of total population 1960 43.523 1961 42.136 1962 40.759 1963 39.396 1964 38.048 1965 36.721 1966 35.413 1967 34.126000000000005 1968 32.86 1969 31.622 1970 30.408 1971 29.221000000000004 1972 28.058999999999997 1973 26.930000000000007 1974 25.828000000000003 1975 24.754999999999995 1976 23.712000000000003 1977 22.701999999999998 1978 21.721999999999994 1979 20.772000000000006 1980 19.852999999999994 1981 18.965999999999994 1982 18.108999999999995 1983 17.283 1984 16.486000000000004 1985 15.719999999999999 1986 14.983000000000004 1987 14.274000000000001 1988 13.593000000000004 1989 12.941000000000003 1990 12.314999999999998 1991 11.715000000000003 1992 11.14 1993 10.590999999999994 1994 10.066000000000003 1995 9.563000000000002 1996 9.082999999999998 1997 8.626000000000005 1998 8.188999999999993 1999 7.772000000000006 2000 7.4140000000000015 2001 7.186000000000007 2002 6.963999999999999 2003 6.748999999999995 2004 6.5390000000000015 2005 6.3359999999999985 2006 6.138999999999996 2007 5.947000000000003 2008 5.760999999999996 2009 5.581000000000003 2010 5.406000000000006 2011 5.239000000000004 2012 5.081000000000003 2013 4.930000000000007 2014 4.787000000000006 2015 4.650000000000006 2016 4.519999999999996 2017 4.397000000000006 2018 4.278999999999996 2019 4.168000000000006 2020 4.061000000000007 2021 3.9599999999999937 2022 3.8640000000000043 2023 3.772999999999996