1995

8.0

2005

6.6

1982

6.4

1998

6.7

2004

6.3

1955

7.3

2001

6.8

2005

6.0

1994

6.8

2006

6.3

1993

7.2

1936

5.8

1931

5.0

1944

7.3

2002

6.5

1925

6.9

2001

6.6

2002

5.3

2006

6.0

2007

6.9