Year	Percent
1950	10.9782
1955	11.27413
1960	10.97183
1965	12.54564
1970	12.50949
1975	12.46564
1980	12.53058
1985	12.25302
1990	11.67772
1995	11.27789
2000	11.08024
2005	10.65192
2010	10.07711
2015	9.33241
2020	9.02478
2025	8.66727
2030	8.22861
2035	7.77603
2040	7.35199
2045	6.97777
2050	6.64502
2055	6.34163
2060	6.06661
2065	5.81743
2070	5.60332
2075	5.42221
2080	5.2698
2085	5.14753
2090	5.04158
2095	4.95064
2100	4.87365