1996

6.7

2007

7.4

2002

6.8

2007

7.0

2007

6.8

1996

6.2

2005

6.7

2005

6.6

2012

6.1

1998

6.7

2004

6.3

1955

7.3

2001

6.8

2005

6.0

2004

7.4

1997

7.2

1924

7.4

2006

6.6

2001

6.5

1940

6.0