Year	Percent
1950	11.55924
1955	12.08023
1960	12.8728
1965	11.85005
1970	11.92485
1975	12.71124
1980	13.32207
1985	12.97833
1990	13.67818
1995	13.41922
2000	14.25775
2005	14.54646
2010	13.01689
2015	12.28542
2020	12.00979
2025	11.86345
2030	11.27333
2035	10.56299
2040	9.89255
2045	9.31602
2050	8.79858
2055	8.32681
2060	7.88091
2065	7.41963
2070	6.99868
2075	6.64965
2080	6.36125
2085	6.13901
2090	5.96828
2095	5.82928
2100	5.71561