Year % of total population 1960 45.3580819105241 1961 45.9876716834874 1962 46.6099830732177 1963 47.2238867406988 1964 47.6720000640257 1965 48.0577083059679 1966 48.5383270563881 1967 49.0090690977643 1968 49.4562820193768 1969 49.8688084535248 1970 50.2127925422567 1971 50.3492573728894 1972 50.1240421543836 1973 49.6381111486415 1974 49.113935764952 1975 48.6401851826412 1976 48.2265376433034 1977 47.8647232604019 1978 47.5324760947217 1979 47.2174858519786 1980 46.9325687728837 1981 46.7197559493949 1982 46.6396418016077 1983 46.6232274961182 1984 46.5787366831336 1985 46.5126347640101 1986 46.4287213406684 1987 46.3051097175344 1988 46.1053603029323 1989 45.8138039489241 1990 45.4358041974723 1991 44.9827029720756 1992 44.4457114299691 1993 43.8485523964079 1994 43.2294155577038 1995 42.5700327927475 1996 41.8519001914776 1997 41.1053420067508 1998 40.3820258446657 1999 39.7023040297761 2000 39.0632052574878 2001 38.4641557837144 2002 37.8855464825538 2003 37.3339880073142 2004 36.8402197855397 2005 36.4163646901137 2006 36.0555938224823 2007 35.7243373969294 2008 35.4008080425642 2009 35.0966106831782 2010 34.8439723483379 2011 34.6716809502366 2012 34.5722020818456 2013 34.4897211806548 2014 34.3824510573575 2015 34.2362813352499 2016 34.045601212881 2017 33.8295640009326 2018 33.6186726936779 2019 33.4117493628739 2020 33.1708818953174 2021 32.9147708855933 2022 32.6030796533926 2023 32.2156426115811