Year	Percent
1950	28.77163
1955	27.61418
1960	26.00461
1965	24.25012
1970	23.31308
1975	23.87892
1980	24.48232
1985	25.78552
1990	27.11368
1995	28.77537
2000	30.51402
2005	31.17626
2010	33.47868
2015	28.40297
2020	29.06658
2025	31.92135
2030	32.56923
2035	33.49883
2040	32.46632
2045	30.90551
2050	29.3307
2055	28.18478
2060	27.59927
2065	26.93033
2070	26.04802
2075	24.9911
2080	23.94751
2085	23.16011
2090	22.6547
2095	22.31287
2100	21.98101