Year	Percent
1950	10.66402
1955	11.68841
1960	10.47929
1965	7.95892
1970	10.28364
1975	9.70144
1980	9.42372
1985	8.07722
1990	7.90286
1995	5.75643
2000	5.30918
2005	5.24099
2010	5.50265
2015	5.17747
2020	5.05842
2025	4.93954
2030	4.83068
2035	4.80415
2040	4.85207
2045	4.8625
2050	4.82465
2055	4.79057
2060	4.77478
2065	4.79157
2070	4.82663
2075	4.8543
2080	4.84811
2085	4.82161
2090	4.78942
2095	4.77445
2100	4.77224