1996

6.4

1998

5.4

2005

8.2

1998

8.2

1993

7.7

2000

7.9

2005

8.2

2007

8.1

1986

5.5

1987

7.7

1996

5.4

2009

8.0

2012

7.2

1989

8.3

2011

8.2

1998

6.0

2008

8.4

1995

8.8

1993

0.0

1999

8.3

1990

6.9