2013

7.2

2014

6.0

2010

4.9

2008

6.7

2016

5.7

2015

7.9

1975

5.0

1995

9.0

2015

4.8

2007

3.3

7.0

2017

5.8

1954

6.3

2006

4.6

1972

5.2

2016

6.4

2003

4.8