Year	Percent
1950	9.38472
1955	10.97404
1960	10.84713
1965	11.31113
1970	10.96903
1975	10.04915
1980	9.58488
1985	8.06226
1990	7.7649
1995	8.09132
2000	8.20572
2005	7.39579
2010	6.84908
2015	7.16777
2020	6.77357
2025	6.57719
2030	6.39165
2035	6.17055
2040	5.94213
2045	5.79214
2050	5.7112
2055	5.63252
2060	5.548
2065	5.44123
2070	5.32911
2075	5.23472
2080	5.16882
2085	5.12022
2090	5.07879
2095	5.02885
2100	4.97412