Year	Percent
1950	14.02276
1955	13.68628
1960	13.44581
1965	13.24586
1970	13.10998
1975	13.12543
1980	14.33511
1985	13.47472
1990	12.69866
1995	13.13824
2000	13.52534
2005	15.41298
2010	17.15459
2015	17.77897
2020	16.84195
2025	20.76181
2030	21.78856
2035	24.10936
2040	26.62708
2045	24.36623
2050	24.87344
2055	24.67226
2060	25.09198
2065	25.75615
2070	25.70903
2075	25.36464
2080	25.05517
2085	24.96988
2090	24.91003
2095	24.68031
2100	24.27734