Year	Percent
1950	28.30669
1955	28.17238
1960	28.56622
1965	27.73076
1970	25.81886
1975	24.83533
1980	24.78104
1985	26.82836
1990	28.83207
1995	31.54772
2000	35.2011
2005	38.60104
2010	39.14666
2015	35.95112
2020	33.03383
2025	30.90717
2030	29.74962
2035	29.73708
2040	29.53959
2045	28.79254
2050	27.38436
2055	25.64535
2060	24.5638
2065	24.12453
2070	24.07556
2075	24.01774
2080	23.6744
2085	23.09011
2090	22.52202
2095	22.19695
2100	22.13675