1996

6.4

1998

3.3

2009

6.7

1996

5.6

1997

9.7

1982

7.6

1988

6.5

1999

8.2

2005

8.1

2006

1.5

1998

5.4

2001

6.9

1989

3.2

1989

5.0

2008

5.3

2003

6.9