1980

6.2

1969

4.3

1977

7.7

1977

5.6

1967

6.1

1974

7.2

1971

8.1

2003

8.0

1975

6.6

1977

6.5

1984

7.5

1966

6.7

1969

7.0

1971

6.2

1967

6.8

1974

6.2

1974

6.1

1981

6.0

1976

6.5

1969

6.0

1992

6.0

1969

5.4

1972

6.5

1967

6.0

1973

6.8

1974

6.4