2020

6.9

2014

6.2

2000

6.7

2017

7.2

2016

5.7

1978

7.4

1990

6.1

1957

7.2

2018

6.4

1993

5.8

2019

7.0

1995

6.3

2008

6.5

2011

6.7

1988

6.8

1999

7.0

2009

6.2

2012

6.4

2017

6.2

2016

6.9