Year	Percent
1950	9.8225
1955	10.22083
1960	10.33195
1965	10.1054
1970	9.79521
1975	9.57882
1980	10.09251
1985	11.20621
1990	10.35036
1995	10.08527
2000	9.82248
2005	9.17922
2010	9.03401
2015	8.7123
2020	8.47589
2025	8.09413
2030	7.71625
2035	7.38421
2040	7.08212
2045	6.80864
2050	6.55627
2055	6.32241
2060	6.0976
2065	5.89914
2070	5.74086
2075	5.60466
2080	5.49432
2085	5.39131
2090	5.29404
2095	5.21266
2100	5.14058