1997

6.5

2016

7.5

2012

7.8

2014

8.0

2019

8.1

2019

7.3

2017

7.4

2019

7.0

2009

7.3

2017

6.1

2016

7.6

2001

6.8

1999

8.2

2018

6.6

1994

6.2

2013

6.7

2009

7.3

2016

7.3

2017

6.8

2015

7.3