1995

8.4

1992

6.9

1973

7.4

1998

5.5

2007

7.5

2013

4.5

2002

5.3

1934

7.5

1997

6.0

1972

6.2

2002

6.2

1998

5.8

2001

6.7

2007

6.8

2008

6.4

2008

5.4

1933

8.4

2007

7.3

2008

6.2

1974

6.5