Year	Percent
1950	8.97638
1955	8.43879
1960	8.02042
1965	8.06843
1970	7.87736
1975	8.15616
1980	8.23151
1985	7.52469
1990	7.97363
1995	8.13039
2000	7.2902
2005	7.33528
2010	7.48182
2015	7.13211
2020	6.73305
2025	6.47055
2030	6.28067
2035	6.12038
2040	5.97667
2045	5.80918
2050	5.61632
2055	5.44309
2060	5.31712
2065	5.22601
2070	5.14544
2075	5.07061
2080	4.99923
2085	4.93417
2090	4.88292
2095	4.85376
2100	4.82778