Year	Percent
1950	21.26831
1955	22.33452
1960	22.42067
1965	22.08897
1970	20.74833
1975	18.27071
1980	17.18215
1985	17.05993
1990	19.43726
1995	22.05028
2000	23.77721
2005	24.89561
2010	24.79235
2015	26.31744
2020	27.78805
2025	28.32117
2030	27.55183
2035	25.02245
2040	22.6594
2045	21.43365
2050	22.23966
2055	23.76364
2060	24.51068
2065	24.15566
2070	23.01227
2075	22.14391
2080	22.04578
2085	22.43169
2090	22.77254
2095	22.68051
2100	22.1942