Year	Percent
1950	18.71163
1955	19.61461
1960	18.91433
1965	18.69193
1970	19.32259
1975	19.70534
1980	20.07341
1985	20.66448
1990	21.4292
1995	22.46642
2000	23.81937
2005	25.33868
2010	25.32722
2015	25.10387
2020	26.44752
2025	27.81477
2030	28.2938
2035	28.39868
2040	27.66468
2045	26.53685
2050	25.7774
2055	25.05809
2060	24.43807
2065	23.80238
2070	23.01421
2075	22.46808
2080	22.18697
2085	22.19522
2090	22.22914
2095	22.15714
2100	21.9638