2007

8.5

1979

7.4

2003

7.2

2008

8.1

2006

7.9

2004

8.3

2001

7.6

2014

8.4

1989

8.0

2005

8.2

2016

8.6

2020

8.5

1975

7.7

2013

7.2

2015

8.5

2004

8.6

2019

8.1

2011

8.5

2006

8.1

2021

8.5