2011

8.3

2014

8.0

2004

7.3

2003

8.2

1995

8.1

1999

8.6

1981

7.9

2006

8.2

2007

8.1

1998

9.0

2011

7.9

2010

7.8

2017

6.4

1990

8.1

2004

8.1

2012

7.7

1984

6.9

2011

7.6

2016

7.0

2006

7.4