1993

7.4

2004

5.9

2017

4.9

2009

6.1

2018

6.5

2007

5.7

5.4

2015

6.4

2015

6.6

6.6

2012

6.4

2011

5.7

2002

4.7

1975

7.0

2005

9.7

2007

6.3

1993

7.2

2003

6.3

2014

5.6