Year	Percent
1950	9.93616
1955	10.45809
1960	10.22853
1965	10.14537
1970	10.60192
1975	9.54512
1980	9.29973
1985	8.50403
1990	7.21719
1995	5.96219
2000	5.50131
2005	5.32573
2010	5.36137
2015	5.09934
2020	4.69823
2025	4.18735
2030	3.95122
2035	4.02258
2040	4.14578
2045	4.20667
2050	4.16451
2055	4.06499
2060	3.99635
2065	4.04831
2070	4.18341
2075	4.31872
2080	4.37513
2085	4.35902
2090	4.31808
2095	4.31451
2100	4.36622