Year	Percent
1950	9.89524
1955	10.23661
1960	10.31972
1965	9.43039
1970	8.5715
1975	9.46726
1980	10.04213
1985	10.13035
1990	9.92228
1995	10.14125
2000	10.67673
2005	11.37649
2010	10.91402
2015	10.28674
2020	9.41418
2025	9.67104
2030	9.92857
2035	9.54578
2040	8.95297
2045	8.39174
2050	8.09283
2055	7.97858
2060	7.81656
2065	7.54118
2070	7.19688
2075	6.90515
2080	6.71301
2085	6.57908
2090	6.45554
2095	6.30199
2100	6.13646