2001

3.2

1965

6.2

1955

7.3

2005

6.0

2000

6.2

1947

7.3

2006

5.5

2001

6.8

2008

5.6

1922

0.0

1931

6.9

1999

1.0

1959

6.7

2010

7.6

1998

2.9

1994

5.4

1992

5.3

2008

3.8

2003

5.7

2005

6.2