2011

5.7

1993

5.5

2008

5.2

2013

5.0

2015

6.4

1996

5.9

2009

6.7

2015

5.2

2010

6.6

2003

6.3

2008

7.8

1988

7.3

2008

4.9

2013

5.5

2004

10.0

1985

6.5

2012

5.4

2014

6.8

2003

6.0

2014

7.1