1989

6.0

1990

6.1

1997

9.7

2004

8.3

2006

8.3

2005

9.0

1993

6.0

1992

6.5

1995

6.0

2006

6.2

1991

7.4

1995

7.5

1996

6.3

2001

8.2

2003

7.4

1993

6.5

1997

7.7

2001

6.3

2003

6.5

2001

6.6

2003

6.5

1987

8.4

2000

8.1

2000

6.8

2005

1.0

1997

7.6

1997

4.7

2007

7.8

2002

7.2