1994 6.6

1993 7.8

1993 6.7

1993 6.6

1993 6.1

1993 5.2

1992 5.6

1992 7.9

1991 3.9

1991 5.9

1991 5.8

1990 7.0

1990 5.4

1990 5.9

1990 6.5

1989 7.0

1988 7.8

1988 8.5

1988 6.8

1987 7.3