2000

6.1

1999

5.2

2014

5.5

2007

6.7

1998

7.3

2005

7.0

2012

6.6

2016

7.9

2015

7.1

2006

6.9

2017

6.9

2018

7.0

2013

7.3

2015

0.0

2017

7.9

2002

8.1

2015

7.1

2021

0.0