Year	Percent
1950	26.53526
1955	25.75525
1960	28.43148
1965	28.23089
1970	27.6993
1975	28.17109
1980	27.86973
1985	29.59174
1990	31.70282
1995	30.96449
2000	28.61986
2005	26.14794
2010	24.10146
2015	24.01841
2020	24.28682
2025	23.2663
2030	21.64174
2035	20.67253
2040	20.33481
2045	20.62941
2050	21.10241
2055	21.29021
2060	21.11731
2065	20.75597
2070	20.5286
2075	20.57902
2080	20.80394
2085	20.98435
2090	20.94226
2095	20.68808
2100	20.38178