Year	Percent
1950	45.53748
1955	45.53085
1960	45.75233
1965	33.7245
1970	21.06564
1975	21.05801
1980	20.18016
1985	21.65622
1990	23.85985
1995	25.35081
2000	28.82927
2005	28.92471
2010	29.78934
2015	29.6628
2020	28.69141
2025	29.8589
2030	30.38572
2035	31.27571
2040	31.58048
2045	31.25775
2050	30.90528
2055	30.68373
2060	30.61854
2065	30.51982
2070	30.28308
2075	29.95241
2080	29.59686
2085	29.25927
2090	28.96968
2095	28.70487
2100	28.4294