2004

5.7

2013

6.3

2016

4.7

2010

6.6

1991

6.4

2008

6.5

1982

6.4

2011

6.4

1998

6.5

2010

5.9

1974

6.6

1989

7.4

2015

5.5

2012

6.9

2006

7.5

1970

6.0

2018

5.7

2003

5.7

2016

4.7

2014

6.1