2015

8.2

2014

6.5

2016

7.3

2007

7.2

2004

7.8

2013

8.1

1985

7.7

2017

6.6

2006

6.9

2005

7.9

2007

7.5

2001

7.0

2014

7.6

2014

7.1

2011

6.4

2003

7.8

2014

7.8

1962

7.3

1966

7.6

1999

7.9