1979 8.7

1979 7.2

1978 7.5

1978 7.1

1978 6.4

1977 6.8

1977 6.6

1977 5.1

1976 6.6

1976 8.2

1976 6.5

1976 7.4

1976 7.3

1976 7.2

1975 8.0

1975 6.4

1975 6.9

1974 7.1

1974 9.0

1974 7.7