Year	Percent
1950	27.85206
1955	29.76526
1960	33.23281
1965	33.58223
1970	33.24296
1975	32.24559
1980	31.81903
1985	31.8626
1990	31.31851
1995	29.63208
2000	30.35174
2005	30.66036
2010	31.62781
2015	29.94576
2020	27.04349
2025	24.51624
2030	22.79999
2035	22.59691
2040	23.92286
2045	24.36293
2050	23.0837
2055	22.1923
2060	21.62736
2065	21.70411
2070	22.3169
2075	22.86172
2080	22.82946
2085	22.29947
2090	21.73655
2095	21.50068
2100	21.62475