Year	Percent
1950	29.28126
1955	29.45003
1960	29.41053
1965	29.0815
1970	27.84518
1975	27.05652
1980	26.44899
1985	26.06224
1990	26.56049
1995	27.35056
2000	28.02658
2005	28.54098
2010	28.70368
2015	28.60816
2020	28.99468
2025	29.69306
2030	30.41748
2035	31.00711
2040	31.17733
2045	31.06932
2050	30.9661
2055	30.91195
2060	30.78758
2065	30.53352
2070	30.17087
2075	29.7555
2080	29.31429
2085	28.8856
2090	28.4456
2095	27.97788
2100	27.48065