1999

7.2

2014

8.0

2018

7.5

2005

7.1

2019

8.1

2001

7.9

2021

6.8

2017

7.4

2019

7.8

2003

8.2

2016

7.0

2013

7.7

2012

6.6

2011

7.6

2013

7.2

2012

7.2

1976

8.1

2009

7.6

2011

6.7

2007

7.8