1983

8.0

1989

1.0

1980

7.5

1990

6.1

1988

5.7

2004

5.8

1993

0.0

2009

5.5

1976

6.5

2013

10.0

2009

6.8

2007

1.0

1975

0.0

1989

0.0

1979

7.0