1996

6.4

1989

5.2

1990

7.4

2003

6.7

1994

6.7

2003

5.1

1987

6.3

2002

6.0

1994

3.9

1999

4.0

1995

5.0

2001

0.0

1995

7.8

2005

7.2

1998

5.0

1997

5.8

2004

4.8

1996

7.2

1998

5.2

1997

5.1

1998

6.8