1990

6.6

2011

5.2

2018

7.5

2014

6.1

2016

6.4

2019

8.2

2013

6.7

2013

6.5

2015

6.8

1994

6.6

2008

7.6

2013

5.8

2018

6.6

2013

7.8

2014

7.4

2010

7.3

2007

6.2

2015

7.2

2016

7.3

2019

6.0