2007

5.7

1988

7.0

1995

8.0

1998

6.6

2006

6.6

2009

6.5

2004

7.3

2011

6.0

1992

6.1

2002

6.9

2005

5.5

2013

6.5

2004

6.5

2013

6.1

2002

6.0

2010

5.9

2013

6.1

2010

6.3

2006

5.3