Year	Percent
1950	10.65561
1955	10.42588
1960	9.56008
1965	13.04775
1970	11.14382
1975	11.84979
1980	13.43255
1985	13.26984
1990	13.31322
1995	12.76275
2000	12.31184
2005	12.03492
2010	12.07044
2015	11.47794
2020	11.51489
2025	11.60207
2030	11.22125
2035	10.81917
2040	10.48555
2045	10.20947
2050	9.96239
2055	9.70212
2060	9.41244
2065	9.11178
2070	8.80615
2075	8.54786
2080	8.27749
2085	8.01682
2090	7.74606
2095	7.48318
2100	7.22497