among the many encounters in which

1992 4.662224 0.214490 4% Est. 2007 9.855161 0.101470 4% Est. 1989 17.026783 0.058731 3.8744% 1988 8.308458 0.120359 3.3218% 1987 4.463922 0.224018 3.1640% 1986 2.563068 0.390157 2.6144% 1985 8.338430 0.119927 2.9715% 1984 8.547384 0.116995 3.6576% 1983 12.369540 0.080844 3.8998% 1982 2.857176 0.349996 6.3831% 1981 14.030542 0.071273 9.6843% 1980 10.202853 0.098012 9.0330% 1979 11.070346 0.090331 8.8650% 1978 4.911594 0.203600 7.2813% 1977 8.012195 0.124810 6.6558% 1976 0.289196 3.457868 6.4073% 1975 0.371952 2.688519 9.8159% 1974 4.285571 0.233341 9.0909% 1973 3.322221 0.301003 6.4509% 1972 0.408613 2.447301 4.7304% 1971 2.009042 0.497750 5.7132% 1970 3.684166 0.271432 5.5272% 1969 2.618496 0.381899 5.5714% 1968 1.115379 0.896557 5.0148% 1967 2.442177 0.409471 2.5719% 1966 0.974926 1.025719 3.5485% 1965 4.506459 0.221904 2.7360% 1964 0.150786 6.631928 1.5423% 1963 0.257146 3.888841 1.5697% 1962 1.049322 0.952996 2.2421% 1961 2.418684 0.413448 0.9709% 1960 0.286908 3.485433 1.6442% 1959 2.082265 0.480246 2.3579% 1958 3.494130 0.286194 2.0623% 1957 0.262396 3.811038 3.5571%

existent