Year	Percent
1950	27.07846
1955	26.72627
1960	26.52013
1965	26.52175
1970	26.83207
1975	27.06707
1980	27.50563
1985	27.34629
1990	26.92469
1995	27.61219
2000	27.82659
2005	28.73465
2010	30.46017
2015	32.9906
2020	34.49885
2025	34.0944
2030	33.23303
2035	32.99321
2040	32.77317
2045	32.75878
2050	32.45329
2055	31.47559
2060	30.3833
2065	29.47501
2070	28.7513
2075	28.06097
2080	27.33077
2085	26.56034
2090	25.83914
2095	25.19183
2100	24.62343