Year	Percent
1950	27.12547
1955	28.04987
1960	27.47151
1965	24.63481
1970	24.72454
1975	25.36868
1980	26.45972
1985	26.43848
1990	26.20388
1995	29.69296
2000	27.16627
2005	28.65847
2010	31.12325
2015	31.15197
2020	31.37176
2025	31.07939
2030	31.20063
2035	32.24532
2040	32.44859
2045	32.01957
2050	31.18758
2055	30.53807
2060	30.12604
2065	29.77005
2070	29.19727
2075	28.33576
2080	27.33543
2085	26.39372
2090	25.61491
2095	24.94058
2100	24.28738