2013

6.2

2014

7.5

2001

5.8

1997

6.8

1995

3.5

2006

5.5

2004

5.2

2014

6.0

1988

0.0

2010

5.3

1996

6.8

2000

7.3

2011

7.0

2015

5.9

2016

6.8

2011

0.0

1988

4.3

2017

7.5

2018

0.0

1991

4.7

1992

4.7

2007

5.6