1979

6.9

1971

8.1

1972

5.8

1976

4.1

1966

7.6

2000

4.5

1973

5.9

1977

7.3

1975

7.2

1982

6.3

1964

5.8

1977

6.3

1962

7.1

1981

6.0

1974

7.5

1974

7.2

1979

6.0

1975

7.0