Year	Percent
1950	8.67469
1955	8.43379
1960	9.23841
1965	10.56177
1970	9.92674
1975	8.6261
1980	7.63663
1985	8.43869
1990	9.05172
1995	8.32203
2000	7.67716
2005	6.71751
2010	5.32771
2015	4.83803
2020	5.18746
2025	5.24509
2030	5.19965
2035	5.03641
2040	4.74375
2045	4.50467
2050	4.51909
2055	4.70546
2060	4.85711
2065	4.89489
2070	4.83999
2075	4.76078
2080	4.74759
2085	4.82499
2090	4.9225
2095	4.9674
2100	4.92354