1986

8.5

1992

8.3

1999

8.6

2014

7.8

1990

9.0

2016

0.0

2003

5.0

2005

8.0

1991

8.5

1993

8.5

2005

2.5

2007

7.9

2006

0.0

2007

8.9

1994

0.0

2004

5.5

2004

8.1

1992

3.5

2002

4.8

1996

6.0