1, 1982 678 8.3;
2, 1983 425 6.4;
3, 1984 625 7.9;
4, 1985 684 9.1;
5, 1986 281 3.2;
6, 1987 587 5.9;
7, 1988 701 8.6;
8, 1989 318 4.0;
9, 1990 516 5.2;
10, 1991 604 7.6;
11, 1992 690 8.4;
12, 1993 420 4.6;
13, 1994 558 7.7;