Year	Percent
1950	16.38047
1955	17.30482
1960	16.22655
1965	15.75952
1970	16.17148
1975	16.56323
1980	18.33694
1985	19.02694
1990	19.61278
1995	21.65884
2000	23.85714
2005	28.24963
2010	30.62469
2015	31.80627
2020	30.02257
2025	26.64735
2030	23.94081
2035	20.34917
2040	19.77687
2045	20.66793
2050	21.27117
2055	22.05863
2060	22.133
2065	21.32945
2070	20.26654
2075	20.98045
2080	21.19682
2085	21.36054
2090	21.16172
2095	20.63632
2100	20.13029