Year	Percent
1950	9.4089
1955	8.88731
1960	9.34992
1965	9.30768
1970	10.31886
1975	10.48166
1980	10.51961
1985	10.26084
1990	9.16414
1995	8.36908
2000	8.34547
2005	8.58416
2010	8.01777
2015	7.26879
2020	6.66946
2025	6.40021
2030	6.00949
2035	5.7895
2040	5.59113
2045	5.39406
2050	5.20395
2055	5.05738
2060	4.96897
2065	4.90225
2070	4.85797
2075	4.81346
2080	4.77413
2085	4.7362
2090	4.7237
2095	4.71532
2100	4.70914