Year	Percent
1950	29.87253
1955	29.76436
1960	29.52692
1965	29.20766
1970	27.9617
1975	26.98531
1980	26.25297
1985	25.78245
1990	26.3035
1995	27.22989
2000	28.0177
2005	28.58302
2010	28.7695
2015	28.6871
2020	29.09339
2025	29.82814
2030	30.57812
2035	31.17446
2040	31.34947
2045	31.23525
2050	31.14038
2055	31.12199
2060	31.04322
2065	30.83098
2070	30.4964
2075	30.10057
2080	29.6747
2085	29.26073
2090	28.83211
2095	28.36907
2100	27.86832