Year Per 100,000 People 1971 5.1294 1975 11.2743 1976 1.9119 1977 6.1015 1978 9.9575 1979 21.6612 1980 5.7559 1981 7.8712 1982 2.6606 1984 6.0165 1985 4.506 1990 3.6294