2012

8.7

2010

7.0

2012

6.4

1980

8.4

2006

7.0

2011

6.6

1967

7.8

2008

5.2

2002

6.0

1943

8.2

1997

6.1

2012

5.6

2016

5.8

2015

6.3

2005

8.6

2003

6.9

2013

6.4

1953

6.6

2006

6.7

5.6