Year	Percent
1950	9.82588
1955	10.72125
1960	10.89464
1965	10.14515
1970	9.42962
1975	9.61822
1980	11.19557
1985	11.45196
1990	11.99509
1995	11.22694
2000	11.35201
2005	10.62195
2010	10.12153
2015	10.06615
2020	9.74245
2025	9.71355
2030	9.70353
2035	9.07772
2040	8.54156
2045	8.1082
2050	7.82539
2055	7.62299
2060	7.36678
2065	7.03444
2070	6.66451
2075	6.36588
2080	6.13808
2085	5.97204
2090	5.81572
2095	5.64682
2100	5.47928