Year	Percent
1950	13.96518
1955	14.22359
1960	13.73946
1965	13.72145
1970	14.19522
1975	14.39658
1980	14.66264
1985	14.93298
1990	15.06205
1995	15.1967
2000	15.10947
2005	15.6564
2010	14.98543
2015	13.67829
2020	13.00906
2025	12.3251
2030	11.61743
2035	10.84449
2040	10.11586
2045	9.42184
2050	8.82529
2055	8.27816
2060	7.7739
2065	7.31252
2070	6.90742
2075	6.55098
2080	6.255
2085	6.00004
2090	5.79026
2095	5.60263
2100	5.44663