1998

8.7

2006

8.2

2012

7.4

2005

8.5

2013

7.6

2012

7.3

2008

8.9

2001

7.7

2018

7.2

1999

8.4

2016

7.2

1960

7.1

2019

7.4

1983

8.1

2017

7.5

2017

6.1

2009

6.0

2021

5.9

2012

6.2

2023

7.7