Year	Percent
1950	6.31949
1955	6.09502
1960	5.84495
1965	5.9417
1970	6.06596
1975	7.02159
1980	7.57282
1985	6.97958
1990	5.90921
1995	5.22833
2000	5.212
2005	5.32747
2010	5.54887
2015	5.03864
2020	5.08714
2025	4.81649
2030	4.68837
2035	4.59854
2040	4.58162
2045	4.58897
2050	4.60183
2055	4.62288
2060	4.62935
2065	4.64195
2070	4.65923
2075	4.67852
2080	4.68677
2085	4.67879
2090	4.65696
2095	4.63247
2100	4.61165