2016

9.7

2018

7.6

2012

5.5

1995

6.1

2002

6.9

2010

6.1

2013

6.1

1987

6.2

2015

6.8

2000

6.3

2020

7.0

7.1

7.8

2007

6.7

2006

5.7

2011

7.1

2020

6.0

2014

7.1

2007

7.0