2005

6.5

2008

6.8

1925

6.9

2008

6.1

1980

5.8

1995

6.5

2007

6.3

2006

7.4

2003

7.2

2005

6.6

1999

6.6

2002

6.5

1980

5.6

2003

6.5

2008

7.3

1993

6.2

1991

6.1

2002

7.0

1990

6.7

1996

6.0