Year	Percent
1950	11.44185
1955	10.88878
1960	11.34805
1965	11.69615
1970	11.70326
1975	11.77026
1980	12.27877
1985	12.44212
1990	11.84951
1995	11.5778
2000	11.9562
2005	12.57948
2010	13.18606
2015	12.82686
2020	12.76937
2025	12.56782
2030	12.61892
2035	12.44301
2040	12.17806
2045	11.84076
2050	11.47174
2055	11.13011
2060	10.80378
2065	10.43767
2070	10.05636
2075	9.67041
2080	9.31709
2085	8.97882
2090	8.65731
2095	8.33969
2100	8.02618