1970

6.0

2004

7.3

2014

5.1

2010

6.0

0.0

1997

6.5

2018

6.1

1998

5.1

2007

8.2

2002

7.0

2015

6.3

1994

5.9

2009

5.5

2008

6.8

2014

7.4

2014

8.2

2016

6.4

2010

6.2

2001

5.4