2011

8.5

2015

8.3

2001

8.1

2007

7.7

2014

7.6

1994

8.0

2009

7.4

2000

6.9

2010

8.1

2006

7.4

1990

7.9

1966

8.0

2003

7.9

2003

7.5

2016

7.8

2009

8.0

2008

7.6

2007

7.9

2001

8.0

2013

8.1