1999

7.4

2003

5.8

1995

6.7

2002

7.2

1996

6.6

2002

7.1

2005

6.4

2001

6.7

2004

3.7

2004

5.6

1987

7.3

1999

6.8

1998

6.6

1993

5.6

1988

5.0

1994

3.1

2004

7.2

2006

7.0

2004

4.6

2003

6.0