Year	Percent
1950	9.76828
1955	8.78971
1960	8.26856
1965	9.18705
1970	10.79448
1975	11.57191
1980	13.22851
1985	11.37938
1990	10.41323
1995	8.62518
2000	9.23707
2005	9.22304
2010	9.35178
2015	8.95956
2020	8.43857
2025	8.10556
2030	7.94807
2035	7.6439
2040	7.34464
2045	7.05255
2050	6.77052
2055	6.52263
2060	6.32579
2065	6.15787
2070	6.01223
2075	5.86837
2080	5.73755
2085	5.62567
2090	5.52777
2095	5.45686
2100	5.39164