Year	Percent
1950	6.75662
1955	6.53026
1960	6.58488
1965	7.18792
1970	7.82458
1975	7.85849
1980	7.43302
1985	6.1829
1990	5.7682
1995	5.87962
2000	6.13631
2005	6.50231
2010	6.26722
2015	5.65671
2020	5.37044
2025	5.50748
2030	5.68202
2035	5.63605
2040	5.55372
2045	5.4919
2050	5.42637
2055	5.40673
2060	5.4555
2065	5.50741
2070	5.50007
2075	5.45158
2080	5.38469
2085	5.32113
2090	5.27685
2095	5.24989
2100	5.2155