2012

6.8

2001

8.4

2006

7.4

2010

8.6

2005

7.5

1999

8.4

2005

8.3

2015

8.2

2005

7.0

2004

7.9

1987

7.7

2011

8.1

1990

6.9

2008

7.6

2016

8.6

2015

8.7

2015

8.2

2001

8.0

1996

7.5

2016

8.0