Year % of total population 1960 77.15322118686191 1961 76.86523351774142 1962 76.54064838073245 1963 76.21137567859216 1964 75.87587965056136 1965 75.53383491493332 1966 75.18400321049181 1967 74.83061448150417 1968 74.48053792122639 1969 74.12856509346433 1970 73.77063709669416 1971 73.38171436451053 1972 72.9379410518584 1973 72.4986466367712 1974 72.05296643999841 1975 71.72214309313604 1976 71.26328782587271 1977 70.80488749394542 1978 70.34127106627913 1979 69.87630670807107 1980 69.39377240198962 1981 68.90782889034445 1982 68.49801770719448 1983 68.08255272585733 1984 67.65860307082225 1985 67.2305121726862 1986 66.80391493017764 1987 66.39116037848919 1988 65.98145342785863 1989 65.56938062377345 1990 65.11895743312685 1991 64.74290500031393 1992 64.39325455101387 1993 64.05754218428571 1994 63.702847931717 1995 63.34621829133689 1996 63.016859574613065 1997 62.68743144556461 1998 62.35237747829516 1999 62.02064495668628 2000 61.68753791275437 2001 61.36493385834694 2002 61.01088250878742 2003 60.6590546869302 2004 60.301152682583904 2005 59.93472385929088 2006 59.55494025083399 2007 59.17491034937357 2008 58.79083386553802 2009 58.40686041881422 2010 58.028457268417235 2011 57.66564948814677 2012 57.3071221820421 2013 56.934678285637844 2014 56.54370117342835 2015 56.13337920102274 2016 55.73209275842344 2017 55.33851903584868 2018 54.939286979155206 2019 54.533592420165085 2020 54.13399397338303 2021 53.729045551124976 2022 53.300261381348356 2023 52.865420184243575