Year % of total population 1960 43.505283314262655 1961 43.724810822507614 1962 43.89819485641468 1963 44.06153371500256 1964 44.20882561943511 1965 44.34581812741478 1966 44.48141434285014 1967 44.59656058843471 1968 44.66394623189513 1969 44.701298450574996 1970 44.73534089079219 1971 44.76615615819857 1972 44.79677770997139 1973 44.81836079049929 1974 44.806674105625625 1975 44.823228657435706 1976 44.85919364334408 1977 44.821265663313035 1978 44.73894293982702 1979 44.646693040530884 1980 44.539671552432885 1981 44.43076569806778 1982 44.321708403360226 1983 44.20953532700718 1984 44.09376711146427 1985 43.967524894430134 1986 43.834764947394746 1987 43.69360179626463 1988 43.52491694270517 1989 43.318744264945614 1990 43.121642755157204 1991 42.812889772565136 1992 42.461388688346425 1993 42.08761454696469 1994 41.672836841294504 1995 41.21800486046073 1996 40.71376027837988 1997 40.159519219358735 1998 39.60332554846875 1999 39.05901943293574 2000 38.5205310461081 2001 37.99847062122085 2002 37.497686953083786 2003 37.02207724430892 2004 36.57336775782361 2005 36.112958965303875 2006 35.59044207785206 2007 35.043989228099235 2008 34.59606314281702 2009 34.25392581748029 2010 34.0197542324988 2011 33.91751456736032 2012 33.88308695306348 2013 33.89991159354774 2014 33.93441192869123 2015 33.93197279280667 2016 33.865897907801596 2017 33.753714566780616 2018 33.61488997425078 2019 33.4563158305478 2020 33.34257125060392 2021 33.20896179500218 2022 32.96116423971037 2023 32.63881525458155