1981

6.5

1978

7.2

1954

7.0

2017

7.8

2004

6.7

1982

8.0

2001

7.7

1974

5.0

2009

6.8

2017

0.0

1998

6.6

1987

4.9

1977

6.2

2000

6.0

2004

7.2

1973

7.6

2000

6.7

2008

5.3

2008

6.1

2008

6.7