Year % of total population 1960 50.1809474314061 1961 50.1688750770882 1962 50.1573352487042 1963 50.1461606743034 1964 50.1333200856358 1965 50.1208435366813 1966 50.1104831039592 1967 50.1039956612751 1968 50.1034477339871 1969 50.1052654133151 1970 50.1112007146053 1971 50.1233817800829 1972 50.1412545135999 1973 50.1642155422876 1974 50.1883038217085 1975 50.2163975928224 1976 50.2485372212087 1977 50.2799019542038 1978 50.3115472713967 1979 50.3433156316534 1980 50.374409419926 1981 50.4049990300562 1982 50.434164702729 1983 50.4626592427775 1984 50.4887540284617 1985 50.5119834353194 1986 50.5331049151103 1987 50.5509835880027 1988 50.5657106153654 1989 50.5774558971329 1990 50.5845743879306 1991 50.5875021200825 1992 50.5876532975242 1993 50.585997613547 1994 50.5813683045117 1995 50.5748942101947 1996 50.5691240455392 1997 50.5616636825368 1998 50.5535091728502 1999 50.5443387874406 2000 50.535057410356 2001 50.5276556167341 2002 50.5202764644044 2003 50.5149781005568 2004 50.5135238346916 2005 50.5140657285148 2006 50.5134519076912 2007 50.5135001444675 2008 50.5108874007717 2009 50.5053395554773 2010 50.4994759319562 2011 50.4875618149107 2012 50.4714512383723 2013 50.454760178124 2014 50.4367768444659 2015 50.4163021803689 2016 50.3943442452789 2017 50.3715247537687 2018 50.3495363484596 2019 50.3303987465028 2020 50.3174872754151 2021 50.310535618948 2022 50.2975800406445 2023 50.2785654846702