2021

1.0

2014

7.4

2017

8.1

2010

6.9

2016

7.5

2012

6.3

2014

7.3

1980

6.6

2016

5.8

2009

6.7

2014

6.0

2006

5.0

2013

6.8

2007

5.8

2014

4.6

2003

6.2

2016

7.0

2003

5.7

1981

5.9