Year	Percent
1950	21.69806
1955	21.8181
1960	21.46187
1965	21.17149
1970	20.79023
1975	19.58151
1980	19.56297
1985	19.75056
1990	21.36072
1995	22.98258
2000	25.23328
2005	26.88335
2010	26.89905
2015	26.72267
2020	25.25019
2025	23.82823
2030	23.43694
2035	23.72447
2040	24.4131
2045	24.51361
2050	24.4828
2055	23.97513
2060	23.82905
2065	23.99317
2070	23.73618
2075	23.46362
2080	23.15319
2085	22.88058
2090	22.67667
2095	22.5401
2100	22.39925