Year % of total population 1960 46.9422423556059 1961 46.9314165347678 1962 46.9318691943783 1963 46.9528251361243 1964 47.0221509037092 1965 47.116652426611 1966 47.2073717586939 1967 47.2984031936128 1968 47.3769411217309 1969 47.424806216082 1970 47.4734641653601 1971 47.5391431260957 1972 47.6031307398276 1973 47.6632994497217 1974 47.7217240513839 1975 47.7800308928924 1976 47.8535326608518 1977 47.9626142149683 1978 48.1020500888051 1979 48.2452857152579 1980 48.3812138708874 1981 48.5135926724712 1982 48.634900998243 1983 48.7323249037969 1984 48.8029089981181 1985 48.8516111257217 1986 48.8897215550655 1987 48.9265604769504 1988 48.9520516421398 1989 48.952389752593 1990 48.9467686614315 1991 48.9489324235087 1992 48.9461081702119 1993 48.9438206958728 1994 48.9460422812193 1995 48.9491790226388 1996 48.9543623766451 1997 49.0027396471565 1998 49.0980277877005 1999 49.1939866800542 2000 49.286123762622 2001 49.3740790399448 2002 49.457679937847 2003 49.5344823912905 2004 49.5983641247187 2005 49.5657488818498 2006 49.485211797993 2007 49.4463982804461 2008 49.4098634012573 2009 49.3937177012639 2010 49.426223864497 2011 49.4827320758685 2012 49.5383390526459 2013 49.5922487463548 2014 49.6506385373115 2015 49.7290059074592 2016 49.8195581995292 2017 49.9087389088761 2018 49.9985959000281 2019 50.0879547541121 2020 50.1590416301505 2021 50.221681723419 2022 50.2690118986032 2023 50.2923297985262