1985

5.5

1994

3.8

1997

7.0

2014

6.3

2008

5.7

2011

6.0

2006

5.5

2006

4.2

1978

7.2

2016

7.1

2013

5.5

2014

4.2

1982

7.4

2005

5.7

2008

4.6

2014

5.0

1987

0.0

2007

5.0

1977

5.3

1982

0.0