Year	Percent
1950	21.78114
1955	23.18402
1960	22.43339
1965	24.15937
1970	25.11969
1975	25.84904
1980	26.88293
1985	25.64089
1990	25.82913
1995	26.27347
2000	27.41598
2005	28.28697
2010	27.32246
2015	27.21168
2020	27.78013
2025	28.07278
2030	28.8056
2035	27.72824
2040	25.02264
2045	23.20774
2050	21.79544
2055	21.5698
2060	22.8532
2065	23.73913
2070	23.35221
2075	22.88082
2080	22.52768
2085	22.50803
2090	22.79922
2095	23.13438
2100	23.11833