2003

5.2

1999

7.9

2004

7.2

2005

8.1

1997

3.7

2004

7.4

2003

3.6

1987

7.7

2003

7.2

2006

4.6

2001

8.0

2000

7.1

1995

7.1

1998

6.9

2002

7.2