Year	Percent
1950	11.07494
1955	11.3605
1960	12.64339
1965	12.63924
1970	11.88125
1975	11.19815
1980	9.3683
1985	6.56616
1990	7.30321
1995	7.05758
2000	7.17795
2005	7.53994
2010	6.94173
2015	6.43564
2020	5.99303
2025	4.97154
2030	4.98352
2035	5.20041
2040	5.46693
2045	5.47559
2050	5.26477
2055	5.02378
2060	4.94922
2065	5.0596
2070	5.19607
2075	5.21344
2080	5.10272
2085	4.95713
2090	4.88697
2095	4.91194
2100	4.98604