Year	Percent
1950	6.78483
1955	6.33291
1960	7.90759
1965	7.8187
1970	8.2535
1975	8.51761
1980	7.74337
1985	6.96286
1990	6.35885
1995	6.23167
2000	6.23571
2005	6.24844
2010	5.80788
2015	5.73038
2020	5.99999
2025	5.96409
2030	5.90125
2035	5.68981
2040	5.51989
2045	5.42301
2050	5.46072
2055	5.54175
2060	5.57904
2065	5.55638
2070	5.48316
2075	5.41446
2080	5.3829
2085	5.3842
2090	5.37787
2095	5.34839
2100	5.28771