1936

8.0

1992

6.9

1997

6.3

1984

6.8

1994

6.7

2011

5.9

2005

7.2

1929

0.0

1928

0.0

2006

5.3

2006

6.4

2007

6.8

2007

5.7

1970

7.5

1974

7.2

2004

6.9

1999

7.7

1958

7.0

2003

4.4

1947

7.5