1999

8.5

2009

8.1

2014

7.8

2016

0.0

1992

8.3

2003

5.0

2005

7.9

1990

9.0

2008

8.2

1986

8.5

2007

7.9

2006

0.0

1989

8.5

1995

0.0

1991

9.0

1994

0.0

2000

5.2

2004

4.8

2004

7.0

2001

6.4