Year	Percent
1950	15.50508
1955	16.32993
1960	14.59781
1965	13.80912
1970	14.14134
1975	15.40807
1980	16.23422
1985	16.60052
1990	16.4602
1995	16.47921
2000	17.22248
2005	18.71755
2010	20.46904
2015	22.14266
2020	23.98641
2025	25.2831
2030	26.05992
2035	26.29569
2040	26.46585
2045	26.35056
2050	26.26197
2055	26.27965
2060	25.9309
2065	25.50174
2070	25.02698
2075	24.47978
2080	24.02509
2085	23.72005
2090	23.52317
2095	23.31886
2100	23.08909