Year	Percent
1950	14.42318
1955	12.69554
1960	15.68193
1965	15.39662
1970	15.5298
1975	15.10229
1980	13.0759
1985	11.80272
1990	11.66742
1995	12.47655
2000	10.12535
2005	9.30253
2010	8.53749
2015	7.70695
2020	7.49334
2025	7.03023
2030	6.50135
2035	6.14887
2040	5.83942
2045	5.5796
2050	5.38377
2055	5.2207
2060	5.07424
2065	4.93828
2070	4.83211
2075	4.75293
2080	4.69446
2085	4.64285
2090	4.5982
2095	4.55075
2100	4.51736