1975

6.2

1997

5.4

1973

5.5

1985

5.2

2006

0.0

1998

4.8

1980

3.5

2017

0.0

1981

7.0

2004

0.0

1991

7.5

1983

6.7

1993

5.2

1976

5.8

1991

5.8

1971

0.0

2013

5.6