2003

6.8

1983

3.0

1995

5.9

1986

0.0

2000

8.0

1994

6.4

1997

0.0

1980

5.3

2006

5.5

1979

6.8

1970

6.0

1989

5.2

1985

5.4

1968

6.7

1985

6.2

1977

7.8

1990

6.0

1984

1.0