2011

6.5

2008

6.6

1958

6.8

2002

5.8

2004

7.0

2011

5.2

1988

5.8

1961

3.7

2004

4.0

2006

6.0

2001

0.0

1943

6.1

1992

5.6

2000

6.2

1993

5.8

2008

6.0

1987

5.0

2002

0.0

2002

5.0

2003

7.4