Year	Percent
1950	17.4233
1955	16.30857
1960	16.55298
1965	17.17248
1970	18.50698
1975	19.00898
1980	20.32539
1985	20.81341
1990	20.99921
1995	20.00098
2000	17.48361
2005	16.16232
2010	15.41543
2015	14.75522
2020	13.6449
2025	12.4705
2030	11.40035
2035	10.49109
2040	9.67334
2045	8.92759
2050	8.23402
2055	7.55957
2060	6.96657
2065	6.48261
2070	6.09202
2075	5.78444
2080	5.53951
2085	5.33637
2090	5.16746
2095	5.03118
2100	4.92633