1997

6.5

2013

7.1

2014

6.7

2010

7.8

2020

7.7

2014

7.6

1999

7.0

1996

6.2

1999

7.9

2006

6.5

2018

7.7

2013

7.7

2011

8.1

2003

2.0

2018

6.9

1999

5.5

1995

6.1

2016

8.6

2013

7.6

2019

6.2

1999

9.0

2009

7.6

2000

3.5

2017

7.0