Year	Percent
1950	29.08542
1955	31.21611
1960	33.44829
1965	31.64876
1970	30.89401
1975	31.01234
1980	30.62691
1985	31.19283
1990	29.96497
1995	28.82059
2000	28.23749
2005	28.46627
2010	28.72223
2015	28.42635
2020	27.57813
2025	26.92685
2030	25.55702
2035	24.5655
2040	24.03704
2045	23.55496
2050	23.33844
2055	23.07954
2060	22.72056
2065	22.36141
2070	22.11571
2075	21.99219
2080	21.92338
2085	21.84585
2090	21.69881
2095	21.50311
2100	21.3242