2008

7.0

1985

6.5

2010

6.9

2011

9.7

1996

5.9

2003

4.9

1997

6.2

1957

7.9

2014

6.6

1978

6.6

2006

6.1

2009

5.6

2012

5.1

2008

6.9

2012

6.1

1931

5.8

2010

6.5

1988

6.7

1968

6.9