Year	Percent
1950	7.64271
1955	8.80164
1960	9.82127
1965	9.13339
1970	6.82972
1975	8.94961
1980	8.52939
1985	8.4502
1990	7.26575
1995	7.32167
2000	5.35545
2005	4.92846
2010	4.87395
2015	4.9793
2020	4.68807
2025	4.58926
2030	4.49167
2035	4.40191
2040	4.38923
2045	4.45182
2050	4.48315
2055	4.47195
2060	4.46961
2065	4.48818
2070	4.53613
2075	4.59684
2080	4.64704
2085	4.65887
2090	4.64688
2095	4.62517
2100	4.61991