2004

8.0

2000

7.2

2014

6.2

1965

6.8

1996

7.4

2011

7.1

2012

6.1

2003

5.8

2015

6.5

1971

6.8

2011

6.2

2007

6.0

2008

8.5

2012

7.2

2011

7.0

2013

7.2

2017

7.3

2004

5.7

2008

7.4

2016

5.5