Year % of total population 1960 62.35212873399454 1961 61.887771002451146 1962 61.410934353679195 1963 60.92216827352393 1964 60.41013727742246 1965 59.89845731374152 1966 59.395179889398584 1967 58.92602553605712 1968 58.4362467927013 1969 57.94375994826385 1970 57.45817345763301 1971 56.94153020714064 1972 56.41920690203556 1973 55.98005310948339 1974 55.40519556110623 1975 54.80597889555715 1976 54.20798295151742 1977 53.6485237244328 1978 53.09728661397393 1979 52.5889520460222 1980 52.12287041751279 1981 51.627876957590345 1982 51.10607775273058 1983 50.72991984964275 1984 50.36159327872068 1985 49.97083130904342 1986 49.55588418119099 1987 49.13873242681508 1988 48.73978530672845 1989 48.34656274718985 1990 47.94748211789046 1991 47.67321500426968 1992 47.50272960727528 1993 47.349828775891076 1994 47.12473805413681 1995 46.91575083120431 1996 46.73515175470609 1997 46.515569006622435 1998 46.31880974352114 1999 46.10512545368408 2000 45.88288603750029 2001 45.6622705604065 2002 45.46041074860549 2003 45.23394864373618 2004 44.96190499040375 2005 44.66307674804688 2006 44.38648713238196 2007 44.12009323012335 2008 43.82544352693499 2009 43.54040791742821 2010 43.35913193654732 2011 43.28434111932649 2012 43.16281881218262 2013 42.953756119333576 2014 42.70517514636706 2015 42.4426677126926 2016 42.177698887941894 2017 41.89213465172084 2018 41.62136867274186 2019 41.39164968688181 2020 41.23795857694422 2021 41.096691518597744 2022 40.83422450973597 2023 40.51938172743448