Year	Percent
1950	12.15248
1955	11.47621
1960	10.54172
1965	10.5473
1970	10.82666
1975	10.81251
1980	10.83596
1985	11.22839
1990	11.90677
1995	11.82102
2000	11.7457
2005	12.16426
2010	12.57972
2015	12.24054
2020	11.91987
2025	11.991
2030	11.99463
2035	11.78923
2040	11.50773
2045	11.24739
2050	10.9927
2055	10.73874
2060	10.46956
2065	10.18896
2070	9.93781
2075	9.68847
2080	9.45024
2085	9.20377
2090	8.97377
2095	8.73944
2100	8.52579