1990

6.9

2012

6.8

2016

7.1

2016

8.0

2017

7.6

2015

7.5

2013

7.5

2014

7.6

1993

7.7

2010

7.8

2016

6.7

2018

7.2

1988

8.1

2006

7.9

2009

7.4

2019

7.5

2013

7.2

2006

7.8

2005

7.6

2009

6.8