Year	Percent
1950	13.16963
1955	12.20095
1960	12.39926
1965	11.6802
1970	13.53904
1975	15.48222
1980	14.86384
1985	12.98359
1990	11.81554
1995	13.5129
2000	12.0595
2005	12.33644
2010	12.10093
2015	12.59234
2020	12.20593
2025	11.04961
2030	10.04616
2035	9.80121
2040	9.88267
2045	9.90149
2050	9.64024
2055	9.04145
2060	8.3702
2065	7.94396
2070	7.81415
2075	7.74821
2080	7.54954
2085	7.17715
2090	6.75344
2095	6.42186
2100	6.25451