1981

5.2

2008

6.2

2003

4.3

1996

6.5

1984

6.9

2010

7.2

2011

5.8

2003

6.5

2013

7.6

1998

0.0

1997

0.0

2009

1.0

2009

8.0

2012

0.0

1994

7.0

2015

7.3

2000

0.0

2005

4.5

2001

0.0

1998

0.0

2001

4.9

2007

5.0

2004

3.4

2001

5.9

2009

6.1

2004

0.0

1999

6.8

2006

4.3

2002

0.0