1980

6.3

1979

4.7

1984

6.9

1984

0.0

1988

0.0

1997

5.0

1994

1.0

1987

0.0

1999

6.8

2008

5.2

2006

7.0

2005

4.3

1985

6.4

2002

0.0

1992

3.4