1989 7.8

1988 7.7

1988 5.8

1988 7.4

1988 7.2

1988 5.2

1988 7.5

1988 6.9

1988 5.7

1988 5.5

1988 6.8

1988 4.9

1988 7.1

1988 6.6

1988 5.9

1987 6.3

1987 7.2

1987 6.3

1987 5.1

1987 4.8