1986

6.2

2019

8.1

1972

8.7

2016

7.7

2010

8.4

2013

7.9

2017

7.6

2011

7.5

2015

7.8

1976

7.8

2010

7.0

2013

7.3

1941

8.0

2000

6.6

2011

6.5

1985

8.3

1993

7.0

2013

7.9

2016

7.6

2021

6.8