1984

7.3

2000

6.7

2014

6.5

2014

4.1

1987

8.0

2008

7.5

2018

6.8

1940

7.9

2020

5.2

1964

7.0

2016

6.9

1985

7.4

2012

9.7

2016

6.7

2019

7.1

2007

7.7

2015

7.4

2010

5.9

1942

6.9

1972

6.4