Year % of total population 1960 53.1788553003231 1961 53.0310122051895 1962 52.8870160644566 1963 52.7220502488212 1964 52.5725250524099 1965 52.4641769787213 1966 52.3614127354244 1967 52.2592839751105 1968 52.1469568110136 1969 52.025259199475 1970 51.8985907278975 1971 51.7529713833422 1972 51.5939096438965 1973 51.4038365025372 1974 51.1954315452296 1975 51.0047953874841 1976 50.745171396906 1977 50.4624998042886 1978 49.880363855235 1979 49.3778555864515 1980 49.1101631312094 1981 48.6216488157963 1982 48.5281503460148 1983 48.8734959497544 1984 49.2545394538296 1985 49.6955578056015 1986 50.2130560612488 1987 50.7621003569067 1988 51.3952575812389 1989 52.9897055284262 1990 54.234188037934 1991 54.3798569810902 1992 54.4504055929895 1993 54.5021656347103 1994 54.5447428821861 1995 54.6163642598391 1996 54.7330365170131 1997 54.8360777726988 1998 54.9195456328599 1999 55.0177067414956 2000 55.1543558195874 2001 55.3654177905923 2002 55.672866390437 2003 56.0629103201639 2004 56.5207740206986 2005 57.096540006572 2006 57.7462626311439 2007 58.3496872842863 2008 58.8654983697984 2009 59.2732212254878 2010 59.5538307235775 2011 59.7054035225612 2012 59.7814271939173 2013 59.8492408743893 2014 59.9192109143063 2015 59.9635782825982 2016 59.9614694630861 2017 59.9191764464322 2018 59.8570549996144 2019 59.797694352408 2020 59.7637176197964 2021 59.7659506815899 2022 59.7902425484878 2023 59.8448182378123