2004

5.6

1987

7.3

1990

7.5

1998

7.8

1999

6.8

1998

6.6

1993

5.5

1994

5.7

2000

0.0

1993

5.0

2005

2.0

1997

1.0

2006

5.4

2004

4.8

1988

5.9

2001

6.1

1976

3.0

1988

4.9

1995

6.6

1931

8.3