Year	Percent
1950	10.58541
1955	13.23749
1960	12.73713
1965	13.40904
1970	13.30725
1975	13.31937
1980	12.87716
1985	13.00183
1990	13.37219
1995	13.67188
2000	11.80611
2005	10.49091
2010	10.41407
2015	10.24551
2020	11.71338
2025	10.57994
2030	9.52788
2035	8.89574
2040	8.75933
2045	8.71173
2050	8.35743
2055	7.87578
2060	7.42134
2065	7.0877
2070	6.87057
2075	6.6534
2080	6.40259
2085	6.13325
2090	5.89363
2095	5.70263
2100	5.55751