Year	Percent
1950	12.03977
1955	12.13285
1960	12.22151
1965	12.2538
1970	12.87522
1975	13.939
1980	13.00666
1985	11.64855
1990	11.54854
1995	11.39677
2000	11.40425
2005	10.61601
2010	9.89713
2015	9.4361
2020	9.07282
2025	8.69682
2030	8.25409
2035	7.80904
2040	7.41817
2045	7.06052
2050	6.75033
2055	6.4781
2060	6.21674
2065	5.9878
2070	5.78736
2075	5.62294
2080	5.48802
2085	5.3753
2090	5.27939
2095	5.20088
2100	5.13194