Year	Percent
1950	30.33601
1955	29.26924
1960	28.65537
1965	27.47069
1970	26.55548
1975	28.24275
1980	29.68556
1985	32.63829
1990	35.07995
1995	35.61968
2000	35.24189
2005	33.79543
2010	33.02869
2015	30.86491
2020	29.21658
2025	27.41797
2030	24.26217
2035	23.37657
2040	23.65818
2045	23.59226
2050	22.92436
2055	21.85469
2060	21.12813
2065	20.95589
2070	21.06019
2075	21.13469
2080	21.01212
2085	20.73159
2090	20.46956
2095	20.39105
2100	20.50569