1981 0.503993 1.984156 9.6843% 1980 0.581406 1.719969 9.0330% 1979 11.228966 0.089055 8.8650% 1978 2.831373 0.353186 7.2813% 1977 2.474256 0.404162 6.6558% 1976 1.917924 0.521397 6.4073% 1975 8.013451 0.124790 9.8159% 1974 0.687016