1980

8.2

2016

5.9

2007

4.9

1989

9.2

2012

6.9

2013

7.7

2010

6.3

1961

6.3

1987

4.5

1973

5.0

2018

6.4

2003

6.4

2021

5.6

2008

6.5

2017

7.6

1994

7.7

2020

7.5

2014

6.0

2022

7.1

2016

6.5