Year	Percent
1950	6.75662
1955	6.53091
1960	7.3051
1965	7.83913
1970	7.95076
1975	7.32861
1980	6.30082
1985	5.89176
1990	6.00803
1995	6.35271
2000	6.77741
2005	6.59172
2010	6.13959
2015	5.40182
2020	5.54829
2025	5.74555
2030	5.68584
2035	5.58272
2040	5.50233
2045	5.42509
2050	5.40111
2055	5.45107
2060	5.50868
2065	5.50581
2070	5.45879
2075	5.38995
2080	5.32696
2085	5.28294
2090	5.25698
2095	5.22172
2100	5.17091