Year % of total population 1960 33.776503946000794 1961 34.49631400956141 1962 35.2202292517243 1963 35.95089325286553 1964 36.68960028709594 1965 37.46041531505248 1966 38.18235456083413 1967 38.8217036467459 1968 39.4819474826533 1969 40.143742841802485 1970 40.807044349912736 1971 41.445325785233116 1972 42.09472508164961 1973 42.745659185517425 1974 43.37749392898814 1975 44.001998074784424 1976 44.66403204481271 1977 45.27743807583295 1978 45.769501524116464 1979 46.24979987608905 1980 46.793072071298866 1981 47.34746333594085 1982 47.89081078756795 1983 48.42163564930107 1984 48.95607207768988 1985 49.461348363101884 1986 49.971101645721596 1987 50.423176602750026 1988 50.7851082227253 1989 51.12350696010651 1990 51.59826249131628 1991 51.93904515601174 1992 52.34748873938892 1993 52.77225562150691 1994 53.1856224560182 1995 53.53846854638053 1996 53.871918461033054 1997 54.210271443258335 1998 54.56794292390516 1999 54.930495381243716 2000 55.294881401135775 2001 55.65742831447585 2002 56.00096655168943 2003 56.33836352507696 2004 56.688814790516155 2005 57.0734157979527 2006 57.452512471085484 2007 57.78675736058108 2008 58.11958143376107 2009 58.46527940716318 2010 58.80442186992565 2011 59.025302159950975 2012 59.24577144973743 2013 59.56942386991448 2014 59.94972698473171 2015 60.356653779430125 2016 60.68819176317563 2017 60.99176097244142 2018 61.29446776124026 2019 61.59112493889501 2020 61.89232066915624 2021 62.202861199159194 2022 62.50899762729045 2023 62.807282598322956