Year	Percent
1950	28.18397
1955	29.04487
1960	29.40227
1965	25.15612
1970	22.34577
1975	22.9048
1980	25.26695
1985	28.6979
1990	30.57972
1995	30.55082
2000	30.81432
2005	31.82814
2010	33.94333
2015	35.09608
2020	34.32055
2025	32.04414
2030	30.08728
2035	28.83079
2040	28.63866
2045	28.66675
2050	27.53591
2055	26.01123
2060	24.83302
2065	24.30153
2070	24.10367
2075	23.80011
2080	23.24835
2085	22.61869
2090	22.16604
2095	21.95593
2100	21.88385