1973

6.3

1971

6.6

1972

6.7

1968

6.2

1969

7.1

1975

5.5

1974

0.0

1972

6.1

1971

5.8

1967

6.5

1973

6.5

1972

6.7

1970

6.3

1971

6.9

1974

5.9

1971

6.8

1967

6.7

1973

6.4

1973

3.0

1975

6.2

1970

6.3