Year % of total population 1960 46.865471683795 1961 46.9681057490521 1962 47.0359827563872 1963 47.0785499659877 1964 47.0678077494418 1965 46.9943684227883 1966 46.8628170799501 1967 46.6598406321478 1968 46.3943807413967 1969 46.077385079892 1970 45.7112206099358 1971 45.2973683831718 1972 44.8409361875599 1973 44.355947184358 1974 43.8721669367985 1975 43.4141354530646 1976 42.9798214469931 1977 42.5601618302572 1978 42.1548806392226 1979 41.7641997864087 1980 41.3862751602213 1981 41.0132886451204 1982 40.6410765388888 1983 40.2719382027295 1984 39.9124456162038 1985 39.568561163839 1986 39.25062671214 1987 38.9545370065217 1988 38.6585895152167 1989 38.3526034689227 1990 38.0307964642454 1991 37.6847500398431 1992 37.3133559033626 1993 36.9198874934466 1994 36.5076265779603 1995 36.0814786600553 1996 35.6502064793631 1997 35.2201910610242 1998 34.7933010375888 1999 34.3720299606631 2000 33.9525490468751 2001 33.5251705944682 2002 33.0800823191301 2003 32.6315324645615 2004 32.194965121152 2005 31.7744121409058 2006 31.3782478802688 2007 31.0052325881861 2008 30.6569331176284 2009 30.3305065962993 2010 30.0156935279381 2011 29.7064897810051 2012 29.3980073447191 2013 29.0878837258027 2014 28.7768625569181 2015 28.4676591816314 2016 28.2227845138212 2017 28.1765921358279 2018 28.3974307016418 2019 28.6041592991999 2020 28.4842447313097 2021 28.1707273330532 2022 27.5742313742299 2023 26.7377906873725