2005

7.5

1997

6.7

2005

7.2

1995

7.7

2003

5.8

1992

6.1

2009

6.2

1953

6.2

2007

5.3

2002

5.8

1997

5.9

1997

4.5

2002

6.2

1999

5.1

2009

6.1

2005

6.3

2008

6.7

2007

6.0

2009

6.6

1943

6.5