Year	Percent
1950	18.33777
1955	18.42683
1960	16.41052
1965	15.09579
1970	16.66035
1975	16.54597
1980	19.53991
1985	18.24015
1990	17.72332
1995	19.66108
2000	20.40438
2005	22.945
2010	23.59505
2015	23.46825
2020	23.11849
2025	22.84541
2030	24.89391
2035	25.56883
2040	24.22418
2045	22.45942
2050	21.72952
2055	23.36717
2060	25.71388
2065	27.30762
2070	26.73382
2075	24.95617
2080	24.22626
2085	24.45055
2090	25.08704
2095	25.43637
2100	25.1893