1980

8.5

2016

7.4

2009

4.5

2006

7.1

2014

7.7

1952

7.0

2012

5.9

2023

8.4

2013

6.8

2003

6.6

2010

6.7

2019

5.4

2004

9.9

2018

5.8

2010

4.3

2008

4.4

2004

5.7

1988

7.1

1990

7.8

2017

6.8