Year	Percent
1950	26.70324
1955	28.53307
1960	32.42727
1965	29.66677
1970	26.81891
1975	27.96562
1980	29.80578
1985	33.59391
1990	34.04889
1995	30.87657
2000	28.25441
2005	28.35996
2010	30.79695
2015	32.35407
2020	31.05882
2025	28.21386
2030	25.51283
2035	24.45661
2040	24.83545
2045	24.84564
2050	23.372
2055	21.41241
2060	20.27791
2065	20.09481
2070	20.4283
2075	20.68667
2080	20.48863
2085	19.97994
2090	19.62056
2095	19.68007
2100	20.04791