Year	Percent
1950	6.278
1955	6.70754
1960	7.69573
1965	6.55001
1970	6.85263
1975	7.93369
1980	7.7112
1985	6.45964
1990	5.64202
1995	5.96228
2000	6.22224
2005	6.04896
2010	5.57354
2015	5.19428
2020	5.65904
2025	5.71288
2030	5.63384
2035	5.47843
2040	5.24494
2045	5.1236
2050	5.17416
2055	5.274
2060	5.29999
2065	5.23913
2070	5.1368
2075	5.05977
2080	5.04557
2085	5.06208
2090	5.05829
2095	5.01169
2100	4.93608