Year Percent 1950 21.71242 1955 21.41015 1960 20.98441 1965 20.20947 1970 19.35372 1975 18.48861 1980 17.30499 1985 15.92767 1990 14.64587 1995 13.59465 2000 13.14853 2005 13.18467 2010 14.20786 2015 15.93246 2020 18.01189 2025 19.94826 2030 21.17072 2035 21.46533 2040 21.11588 2045 20.56989 2050 20.66423 2055 21.7127 2060 22.96376 2065 23.95249 2070 24.39825 2075 24.31644 2080 24.28142 2085 24.49294 2090 24.80832 2095 25.05955 2100 25.14239