Year	Percent
1950	29.66742
1955	28.97687
1960	27.64174
1965	27.54457
1970	27.16986
1975	30.0868
1980	32.7638
1985	32.29669
1990	31.35488
1995	31.07098
2000	30.91632
2005	31.08668
2010	32.54798
2015	32.99861
2020	30.3881
2025	27.68494
2030	26.0146
2035	24.81955
2040	23.76008
2045	22.74679
2050	21.66632
2055	20.90876
2060	20.4781
2065	20.38794
2070	20.37738
2075	20.31616
2080	20.18144
2085	20.05483
2090	20.01341
2095	20.04468
2100	20.09184