Year	Percent
1950	8.1305
1955	6.75676
1960	6.58404
1965	8.12249
1970	8.85875
1975	9.98524
1980	9.8183
1985	9.35573
1990	8.5409
1995	9.23435
2000	8.26341
2005	9.07097
2010	8.55022
2015	9.10042
2020	9.29891
2025	9.24507
2030	8.69255
2035	8.15266
2040	7.89003
2045	7.82265
2050	7.76448
2055	7.62884
2060	7.39424
2065	7.12043
2070	6.88048
2075	6.70854
2080	6.57732
2085	6.42859
2090	6.24953
2095	6.05901
2100	5.89248