2011

8.3

2015

7.5

2013

7.7

2016

8.6

1993

8.4

2014

8.3

2002

8.3

2021

7.6

1999

7.4

2017

7.7

2019

7.6

2009

8.0

2004

7.6

2010

7.8

2018

7.9

2017

7.4

2005

7.0

1980

7.3

2017

6.5

2012

6.8