Year	Percent
1950	29.01113
1955	28.26161
1960	28.05175
1965	27.27577
1970	27.36838
1975	28.6669
1980	29.84504
1985	31.45366
1990	32.39475
1995	32.68974
2000	33.0447
2005	33.46024
2010	33.57721
2015	33.23534
2020	32.37416
2025	30.65443
2030	28.83731
2035	27.32735
2040	25.73484
2045	24.46712
2050	23.55732
2055	22.6269
2060	21.82013
2065	21.20289
2070	20.78918
2075	20.51984
2080	20.3494
2085	20.24147
2090	20.14993
2095	20.08729
2100	20.05733