Year	Percent
1950	10.86218
1955	10.01886
1960	8.79705
1965	9.90259
1970	10.77333
1975	11.79526
1980	11.93063
1985	11.8022
1990	8.63398
1995	9.32095
2000	10.47973
2005	11.2926
2010	10.25769
2015	10.23018
2020	8.16968
2025	9.83174
2030	9.72715
2035	9.58033
2040	9.20106
2045	8.62159
2050	8.18075
2055	8.14743
2060	8.29051
2065	8.21196
2070	7.90719
2075	7.50693
2080	7.17826
2085	7.02442
2090	6.98966
2095	6.92663
2100	6.73187