Year	Percent
1950	9.30148
1955	8.49514
1960	8.13423
1965	8.06706
1970	8.26244
1975	8.0896
1980	8.32734
1985	7.78514
1990	8.02992
1995	7.4731
2000	6.47082
2005	5.35041
2010	5.03877
2015	4.99344
2020	4.79422
2025	4.5994
2030	4.19468
2035	3.77078
2040	3.60818
2045	3.72001
2050	3.88993
2055	4.00719
2060	4.02468
2065	3.97646
2070	3.94532
2075	4.01995
2080	4.16647
2085	4.31041
2090	4.38053
2095	4.38059
2100	4.34928