Year	Percent
1950	9.72585
1955	8.72794
1960	9.03868
1965	8.45921
1970	8.44342
1975	7.82708
1980	7.48616
1985	6.74613
1990	5.35984
1995	4.90032
2000	4.78236
2005	4.76001
2010	4.90044
2015	4.27788
2020	3.78391
2025	3.52353
2030	3.53908
2035	3.65961
2040	3.79176
2045	3.81686
2050	3.71878
2055	3.61833
2060	3.62875
2065	3.76155
2070	3.94513
2075	4.08603
2080	4.13401
2085	4.10626
2090	4.07515
2095	4.09657
2100	4.1702