1972

6.4

1967

5.0

2000

6.0

1976

7.1

1975

7.3

1964

7.9

1993

8.2

1965

6.0

1973

6.8

1996

8.1

1976

5.7

1978

4.5

1974

7.6

1986

8.3

1969

6.1

1987

7.7

1980

5.8

1977

7.0

1968

6.5

1996

7.8

1979

5.5

1975

7.3

1992

4.8

1974

6.0

1964

4.5

1977

6.3

1962

6.2

1970

6.7

1978

0.0

1980

5.0