Year	Percent
1950	21.77332
1955	22.60565
1960	22.03429
1965	20.40896
1970	18.97465
1975	21.83606
1980	23.92225
1985	29.88109
1990	26.77108
1995	28.32178
2000	28.73577
2005	30.3121
2010	34.32559
2015	35.48206
2020	34.85838
2025	32.0517
2030	28.88756
2035	27.95243
2040	27.79713
2045	27.73674
2050	26.40878
2055	24.42217
2060	22.71689
2065	21.86831
2070	21.73317
2075	21.67941
2080	21.1999
2085	20.37831
2090	19.64095
2095	19.30318
2100	19.35438