Year	Percent
1950	27.44271
1955	28.2071
1960	29.55958
1965	29.27198
1970	28.22989
1975	27.14246
1980	27.37425
1985	28.41248
1990	29.86854
1995	31.32867
2000	32.53931
2005	33.32856
2010	33.34524
2015	32.34488
2020	31.64657
2025	30.73364
2030	29.80288
2035	29.06823
2040	27.97377
2045	26.85366
2050	25.75868
2055	24.68218
2060	23.80273
2065	23.15902
2070	22.68851
2075	22.2617
2080	21.8614
2085	21.49252
2090	21.19383
2095	21.00175
2100	20.88195