Year	Percent
1950	15.73509
1955	15.46318
1960	14.43186
1965	14.41978
1970	13.86205
1975	14.29213
1980	15.83794
1985	16.9265
1990	19.10085
1995	20.96536
2000	24.20772
2005	27.80698
2010	31.03824
2015	33.09166
2020	32.24269
2025	31.25062
2030	29.2212
2035	28.29454
2040	27.73741
2045	26.04323
2050	24.81429
2055	22.71969
2060	21.49541
2065	21.63059
2070	22.38324
2075	23.01697
2080	23.04482
2085	22.65387
2090	22.06022
2095	21.70416
2100	21.86079