Year	Percent
1950	13.14198
1955	12.96022
1960	14.21165
1965	14.17376
1970	14.02784
1975	14.12394
1980	15.02155
1985	15.37357
1990	15.62074
1995	15.07746
2000	14.72759
2005	14.26118
2010	14.11696
2015	14.33437
2020	14.34892
2025	13.55706
2030	12.81868
2035	12.24324
2040	11.82085
2045	11.44732
2050	11.03287
2055	10.57998
2060	10.10731
2065	9.66774
2070	9.28835
2075	8.95081
2080	8.61323
2085	8.27921
2090	7.95143
2095	7.61668
2100	7.31872