2008

7.6

2015

6.7

2005

7.5

2002

8.6

2012

6.4

1986

8.4

2013

7.1

2006

5.5

2004

7.3

2001

8.5

2002

5.1

1995

8.1

2009

6.4

1975

8.2

2015

6.5

2013

8.0

2007

7.4

2016

7.7

2012

7.8

2013

7.5