Year	Percent
1950	25.94397
1955	25.26931
1960	27.24583
1965	28.22535
1970	28.43533
1975	29.10974
1980	30.21448
1985	31.21869
1990	32.81017
1995	34.02119
2000	31.73756
2005	29.11714
2010	26.89552
2015	26.99106
2020	26.27332
2025	24.55067
2030	22.84119
2035	21.42544
2040	21.23514
2045	21.55639
2050	21.90127
2055	21.92629
2060	21.59385
2065	21.20859
2070	21.06052
2075	21.22853
2080	21.51387
2085	21.65858
2090	21.53767
2095	21.23419
2100	20.94116