Year	Percent
1950	15.37222
1955	15.69781
1960	15.82669
1965	15.65081
1970	15.29937
1975	14.63757
1980	14.46775
1985	13.45713
1990	12.55802
1995	12.25699
2000	12.71078
2005	13.73055
2010	14.93503
2015	16.56332
2020	18.09734
2025	19.92431
2030	22.10541
2035	24.3347
2040	25.85784
2045	26.57136
2050	26.97174
2055	26.92667
2060	27.0593
2065	27.23168
2070	26.96501
2075	26.53142
2080	25.99454
2085	25.47626
2090	24.98964
2095	24.52571
2100	24.08913