Year	Percent
1950	13.17826
1955	13.50575
1960	13.72232
1965	13.96891
1970	14.36582
1975	14.71802
1980	15.0777
1985	15.26969
1990	15.23219
1995	15.1851
2000	14.08725
2005	13.78675
2010	14.13932
2015	14.13532
2020	13.53672
2025	12.84597
2030	12.30421
2035	11.92789
2040	11.56192
2045	11.15531
2050	10.72165
2055	10.28186
2060	9.90369
2065	9.54214
2070	9.22177
2075	8.89265
2080	8.56348
2085	8.25688
2090	7.97309
2095	7.68457
2100	7.43065