Year	Percent
1950	8.80204
1955	8.08596
1960	7.83878
1965	10.24073
1970	11.08376
1975	9.62338
1980	8.9415
1985	8.85735
1990	9.77452
1995	9.65377
2000	9.16214
2005	8.38523
2010	7.89335
2015	8.02047
2020	7.98931
2025	8.22737
2030	8.57621
2035	7.94645
2040	7.49224
2045	7.22486
2050	7.14185
2055	7.12149
2060	7.05754
2065	6.85949
2070	6.58257
2075	6.3101
2080	6.1142
2085	5.99599
2090	5.89321
2095	5.77474
2100	5.62036