Year	Percent
1950	8.51388
1955	7.86944
1960	7.87718
1965	8.31686
1970	7.83586
1975	6.51043
1980	5.35965
1985	5.42948
1990	5.51786
1995	5.76133
2000	5.33247
2005	4.69597
2010	4.68367
2015	4.94184
2020	5.08937
2025	4.94235
2030	4.72489
2035	4.53206
2040	4.45534
2045	4.49915
2050	4.59861
2055	4.65621
2060	4.64138
2065	4.57283
2070	4.51116
2075	4.49109
2080	4.50754
2085	4.52846
2090	4.51432
2095	4.45836
2100	4.38139