1996

6.5

1997

4.5

2004

4.3

2005

4.8

2014

5.0

2010

6.0

2014

7.3

2001

3.7

1999

0.0

2012

5.6

2011

0.0

1994

7.0

1970

6.1

2001

0.0

2007

6.7

2004

6.1

2014

5.8

1995

4.8

2012

6.9

2016

3.7

2005

6.0

2006

6.4

2013

6.6