2009

7.7

2010

6.6

2013

7.6

2012

7.0

2014

7.4

2006

5.1

2017

7.6

1998

8.8

1975

6.0

2008

5.4

2014

5.4

2017

7.3

2018

7.1

2018

6.4

2018

7.0

2012

9.7

2018

5.9