Year % of total population 1960 33.776503946000794 1961 34.49631400956142 1962 35.220229251724305 1963 35.95089325286553 1964 36.689600287095935 1965 37.46041531505247 1966 38.18235456083412 1967 38.821703646745895 1968 39.4819474826533 1969 40.143742841802485 1970 40.807044349912736 1971 41.445325785233116 1972 42.09472508164961 1973 42.745659185517425 1974 43.37749392898813 1975 44.001998074784424 1976 44.6640320448127 1977 45.27743807583296 1978 45.76950152411646 1979 46.24979987608905 1980 46.793072071298866 1981 47.347463335940866 1982 47.89081078756795 1983 48.42163564930105 1984 48.956072077689875 1985 49.46134836310188 1986 49.97110164572158 1987 50.423176602750026 1988 50.7851082227253 1989 51.12350696010651 1990 51.457779837696094 1991 51.794601189838325 1992 52.199199950551716 1993 52.61975870152361 1994 53.02857989983372 1995 53.37628891090301 1996 53.704137615425914 1997 54.03679188848388 1998 54.393678621993544 1999 54.75663263204323 2000 55.12147100404749 2001 55.484478669267496 2002 55.82800068570284 2003 56.16530239674077 2004 56.51606967059213 2005 56.901412349822486 2006 57.281170861597616 2007 57.61557574039377 2008 57.948235716979504 2009 58.2940257442493 2010 58.63331025182258 2011 58.85291658491264 2012 59.07207739755114 2013 59.39586700172802 2014 59.77709928370429 2015 60.185203004001046 2016 60.516808500414186 2017 60.82028707296068 2018 61.12194590502151 2019 61.417445402604244 2020 61.71734442900722 2021 62.02650424878021 2022 62.33118366870368 2023 62.62799103344683