1997

5.4

2001

1.0

2005

0.0

2012

0.0

2012

5.9

2007

0.0

2013

0.0

2013

5.3

2014

4.6

2016

4.8

1970

6.1

1999

5.5

2009

6.1

1995

4.5

1999

6.8

2006

6.6