1997

6.2

1989

6.2

1999

6.1

1992

6.0

2004

4.9

1994

4.5

2007

6.3

2001

7.8

1989

6.4

2008

7.7

1987

1.7

1998

6.6

2003

10.0

2002

5.5

1991

7.3

1993

6.1

1993

0.0

1987

5.0

1992

6.0

2002

6.4

1992

6.5

1993

3.5

1992

8.2