1992

6.1

2005

6.3

1943

6.5

1995

7.8

2003

5.8

2002

5.8

2007

6.0

2005

7.2

1999

5.0

2002

6.2

2008

6.7

1997

5.8

1997

4.5

1997

6.7

1964

7.1

1957

6.4

1993

6.5

2009

6.6

1953

6.1

2003

5.3