2008

5.4

2012

6.4

2002

6.4

1998

10.0

2014

7.5

2011

6.3

2007

6.0

1997

3.0

2013

0.0

1978

5.5

2005

3.8

2007

10.0

2006

0.0

1999

4.4

1995

7.8