Year	Percent
1950	29.1643
1955	29.03334
1960	28.77782
1965	28.08089
1970	27.22885
1975	26.45049
1980	25.69495
1985	25.32517
1990	25.37309
1995	25.89084
2000	26.93673
2005	28.16576
2010	29.1882
2015	29.72748
2020	29.91039
2025	30.13844
2030	30.58367
2035	31.13877
2040	31.56109
2045	31.60274
2050	31.33102
2055	30.98705
2060	30.69232
2065	30.42109
2070	30.12019
2075	29.74628
2080	29.3201
2085	28.87338
2090	28.44794
2095	28.04127
2100	27.64429