1979

6.9

2009

9.0

1987

6.4

1978

4.0

1977

4.0

1992

5.7

2020

5.0

2016

7.6

1993

2.0

2001

7.6

1996

9.2

1998

5.9

2016

0.0

2005

5.0

1997

5.7

2014

0.0

1991

6.8

2014

0.0

1995

7.7

1994

8.3