Year	Percent
1950	7.06343
1955	6.63794
1960	7.35656
1965	8.66902
1970	9.28734
1975	9.65969
1980	9.24212
1985	7.9597
1990	7.12199
1995	6.89114
2000	7.0741
2005	7.30403
2010	7.17664
2015	6.65678
2020	6.39155
2025	6.26037
2030	5.80158
2035	5.89258
2040	5.97722
2045	5.94666
2050	5.85101
2055	5.73933
2060	5.65142
2065	5.61818
2070	5.63132
2075	5.62296
2080	5.5709
2085	5.50311
2090	5.44512
2095	5.4169
2100	5.40124