Year	Percent
1950	15.89873
1955	15.6569
1960	15.49078
1965	15.26126
1970	14.91106
1975	14.53098
1980	14.24313
1985	14.26416
1990	14.51702
1995	15.97804
2000	17.15129
2005	18.16536
2010	19.07432
2015	19.87051
2020	20.51475
2025	21.70669
2030	23.10822
2035	24.19499
2040	24.92188
2045	25.03185
2050	24.98144
2055	25.31945
2060	25.722
2065	26.02835
2070	26.03971
2075	25.69294
2080	25.34934
2085	25.09389
2090	24.89746
2095	24.69309
2100	24.42917