Year	Percent
1950	27.25491
1955	26.8312
1960	26.36234
1965	25.18848
1970	24.59601
1975	25.14627
1980	25.94832
1985	26.86375
1990	27.83905
1995	28.38993
2000	29.37844
2005	30.64646
2010	31.91227
2015	33.34213
2020	34.13033
2025	34.24355
2030	33.49552
2035	31.89207
2040	30.28298
2045	28.78766
2050	27.63539
2055	26.76739
2060	25.74374
2065	24.66981
2070	23.68428
2075	22.8953
2080	22.30378
2085	21.86456
2090	21.50702
2095	21.19521
2100	20.92173