2008

6.0

2011

5.8

2012

0.0

2005

2.0

2010

6.8

2000

5.7

1988

8.2

2015

6.8

2014

6.0

2013

5.4

2013

7.9

2003

8.0

1997

7.3

1996

8.0

2013

7.6

1977

7.0

2012

1.0

2009

0.0

2012

7.2

2013

6.0