1997

7.3

2003

6.0

2001

5.4

2006

0.0

2003

9.0

1999

6.5

2003

5.5

1978

7.2

2014

6.3

1985

5.5

2004

2.5

2014

0.0

1990

0.0

2011

4.0

2007

5.0

2012

5.0

2008

5.7

2013

5.2

1953

6.0

2006

4.2