2012

8.0

2015

6.2

2011

6.4

2009

7.1

2006

6.1

2014

6.3

2018

6.8

2016

6.6

2017

6.9

2001

5.2

1953

7.0

1999

7.3

1994

5.3

1955

6.0

1972

7.3

2013

6.0

2017

6.5

1992

6.3

2014

6.2