1987

5.8

1986

4.5

1983

0.0

1979

7.6

1999

7.0

1974

6.8

1976

8.7

1990

0.0

1974

0.0

1977

7.2

2002

6.6

1979

4.4

1975

0.0

2001

6.4

2000

6.0

1990

1.0