Year	Percent
1950	8.54707
1955	8.63921
1960	8.24811
1965	5.75239
1970	5.26739
1975	5.68174
1980	7.00889
1985	7.47583
1990	9.82413
1995	10.89343
2000	13.3407
2005	16.90665
2010	19.97244
2015	22.82177
2020	25.72573
2025	27.95307
2030	29.48784
2035	30.00887
2040	29.70048
2045	28.77835
2050	27.56565
2055	28.54874
2060	30.02871
2065	31.83123
2070	34.13323
2075	36.68282
2080	38.74881
2085	40.38225
2090	41.7751
2095	43.03006
2100	44.07448