1983

6.8

2011

4.0

1990

6.0

1989

0.0

2006

6.0

2008

6.3

2008

2.0

2006

4.7

1992

5.0

2000

6.5

2003

5.1

1998

6.6

2004

5.2

2004

2.9

2013

5.1

1987

7.5

2005

2.0

2002

4.5

1999

6.7

1993

8.5