Year	Percent
1950	10.34766
1955	9.51235
1960	8.62034
1965	8.04359
1970	7.80558
1975	7.9928
1980	7.88506
1985	7.02458
1990	6.55873
1995	5.25384
2000	4.23643
2005	4.52333
2010	5.09433
2015	4.94175
2020	4.90958
2025	4.77757
2030	4.56213
2035	4.47746
2040	4.66717
2045	4.89349
2050	4.95891
2055	4.90478
2060	4.81671
2065	4.77983
2070	4.84423
2075	4.95932
2080	5.02265
2085	4.98198
2090	4.88038
2095	4.79455
2100	4.77426