1969

7.1

1967

6.8

1974

5.3

1972

6.8

1971

5.8

1974

5.8

1970

6.7

1974

5.9

1973

6.3

1975

6.9

1972

6.7

1972

5.6

1973

6.5

1968

0.0

1974

6.3

1972

6.9

1970

6.7

1973

3.0

1970

6.2

1967

6.3

1971

6.9

1973

6.2

1972

6.7

1975

5.5

1974

0.0

1975

6.2

1972

5.7

1971

6.6

1971

6.8

1974

6.4

1966

6.5

1968

6.3

1973

6.3

1973

5.6

1970

6.3