Year	Percent
1950	9.3217
1955	9.33659
1960	9.24612
1965	7.98733
1970	10.9549
1975	11.14582
1980	11.27615
1985	10.83807
1990	10.08805
1995	10.39613
2000	10.68263
2005	10.30597
2010	8.57907
2015	7.07103
2020	6.38514
2025	6.62038
2030	7.64654
2035	7.26706
2040	6.58591
2045	5.88738
2050	5.493
2055	5.51891
2060	5.72207
2065	5.79427
2070	5.62827
2075	5.34277
2080	5.14399
2085	5.11194
2090	5.17651
2095	5.21795
2100	5.16864