Year	Percent
1950	17.205
1955	16.02528
1960	13.78631
1965	12.62744
1970	14.64298
1975	15.22466
1980	18.73505
1985	17.74313
1990	17.41373
1995	19.19568
2000	19.63116
2005	22.14686
2010	22.86571
2015	22.86025
2020	22.5973
2025	22.5222
2030	24.58298
2035	25.34448
2040	24.11583
2045	22.44213
2050	22.10179
2055	24.04255
2060	26.49511
2065	28.12085
2070	27.50683
2075	25.68719
2080	24.94626
2085	25.18886
2090	25.86168
2095	26.24573
2100	26.00588