Year	Percent
1950	9.29523
1955	9.42527
1960	8.69013
1965	10.08002
1970	11.88499
1975	13.0287
1980	12.00245
1985	9.29579
1990	8.48986
1995	6.63277
2000	6.68618
2005	6.9733
2010	7.1951
2015	6.60198
2020	5.80379
2025	5.2028
2030	4.96118
2035	4.73193
2040	4.57921
2045	4.53126
2050	4.43006
2055	4.30618
2060	4.20894
2065	4.15902
2070	4.14265
2075	4.1406
2080	4.12269
2085	4.08507
2090	4.03852
2095	4.00974
2100	3.98416