1987

8.3

1998

5.7

2006

6.6

2005

4.5

2004

4.9

2002

0.0

2003

5.9

2002

4.4

2002

4.0

2002

3.6

2000

5.0

1998

6.6

1998

7.6

1998

7.3

1997

6.2

1996

3.5

1995

6.0

1994

6.3

1993

7.5

1993

6.0