Year	Percent
1950	14.80226
1955	14.44212
1960	14.25026
1965	13.99409
1970	13.64723
1975	13.04093
1980	12.25461
1985	11.42993
1990	10.65143
1995	10.96771
2000	11.1962
2005	11.41014
2010	11.5728
2015	11.59382
2020	11.93096
2025	12.29801
2030	12.76959
2035	13.20763
2040	13.67978
2045	14.45964
2050	15.48099
2055	16.50988
2060	17.46598
2065	18.28918
2070	18.99929
2075	19.72139
2080	20.44639
2085	21.10658
2090	21.66782
2095	22.13997
2100	22.54761