Year	Percent
1950	10.85047
1955	19.45842
1960	18.42667
1965	19.04005
1970	18.22626
1975	17.07345
1980	17.31896
1985	18.1008
1990	18.45017
1995	16.3029
2000	14.33625
2005	12.41574
2010	11.14367
2015	10.27654
2020	9.73794
2025	9.02029
2030	8.21844
2035	7.49233
2040	6.91493
2045	6.47352
2050	6.12545
2055	5.8196
2060	5.54826
2065	5.31472
2070	5.1268
2075	4.99455
2080	4.90937
2085	4.8399
2090	4.78259
2095	4.72976
2100	4.68837