1979

5.5

1988

5.0

1971

7.8

1979

6.5

1997

9.7

1971

8.1

1974

4.6

1965

7.9

2001

6.8

1974

4.6

1984

7.4

1981

7.6

1984

7.1

1995

7.3

1979

6.7

1973

7.0

1993

6.9

1985

7.7

1980

7.3

1986

7.2

1979

5.1

1985

7.5

1980

6.9

1976

7.5

1978

4.2

1992

6.7

1972

7.4

1977

4.8

1983

7.5

1979

6.0

1974

5.2

1977

7.3

1989

5.7

1974

7.6

1972

6.8