Year	Percent
1950	19.48221
1955	19.7276
1960	18.48681
1965	18.68909
1970	19.76076
1975	22.04971
1980	22.6557
1985	20.79843
1990	23.80839
1995	26.02625
2000	27.88613
2005	29.33339
2010	27.45734
2015	26.40034
2020	26.1516
2025	26.75819
2030	28.4762
2035	29.33647
2040	28.51871
2045	26.46331
2050	24.33398
2055	22.76316
2060	22.27703
2065	22.89079
2070	23.29421
2075	23.17159
2080	22.75775
2085	22.25875
2090	22.02026
2095	22.14857
2100	22.41129