Year	Percent
1950	15.39784
1955	15.81159
1960	15.93511
1965	15.38924
1970	15.36067
1975	15.12777
1980	14.88092
1985	15.30926
1990	16.51155
1995	18.77377
2000	21.53208
2005	24.60145
2010	25.67921
2015	26.09908
2020	26.66235
2025	28.14634
2030	29.8501
2035	29.77586
2040	28.35387
2045	25.80965
2050	24.72243
2055	25.2563
2060	26.09981
2065	26.03786
2070	25.1067
2075	24.0878
2080	23.74696
2085	23.95754
2090	24.25422
2095	24.24646
2100	23.89638