Year	Percent
1950	15.55184
1955	15.53076
1960	14.91502
1965	13.94702
1970	13.35709
1975	13.26517
1980	13.87864
1985	14.04066
1990	14.96472
1995	16.80761
2000	18.55562
2005	19.51064
2010	20.2692
2015	20.55641
2020	21.53357
2025	23.4778
2030	26.33623
2035	28.77986
2040	29.94334
2045	29.20841
2050	27.30057
2055	25.65778
2060	25.02646
2065	25.24796
2070	25.67137
2075	25.6037
2080	25.04609
2085	24.28299
2090	23.75409
2095	23.62369
2100	23.71598