5.3

2008

7.5

2012

5.1

2018

5.9

1968

6.9

2000

5.5

2014

7.3

2006

5.6

2011

5.6

2010

7.4

1993

5.3

2012

7.2

2016

6.3

2009

4.9

5.6

2011

7.5

2011

5.5

2017

5.9

1993

6.1