2006

6.2

2006

5.4

2004

6.3

2003

6.3

1998

7.0

1989

6.3

2008

6.7

2008

6.3

2002

6.1

2005

6.2

1988

6.8

2006

6.4

1996

6.7

2001

5.7

1987

6.3

2002

6.1

2004

5.0

2005

6.4

2001

5.5

2005

6.4