Year	Percent
1950	27.71532
1955	27.91755
1960	28.11617
1965	28.1158
1970	28.06327
1975	27.41636
1980	26.88068
1985	25.9783
1990	25.53914
1995	25.64038
2000	25.74194
2005	26.6415
2010	27.37759
2015	29.01961
2020	31.16831
2025	32.60934
2030	33.38146
2035	33.50536
2040	33.07488
2045	32.54477
2050	32.0854
2055	31.41095
2060	30.56127
2065	29.63973
2070	28.73611
2075	27.86211
2080	27.03439
2085	26.23197
2090	25.46605
2095	24.75879
2100	24.12041