2017

6.9

2018

6.8

2021

7.2

1986

7.6

2018

7.9

2018

5.9

2014

5.7

1994

6.5

2011

5.5

1975

7.8

1957

7.4

2001

7.2

2018

7.1

2010

6.7

2013

7.3

2018

8.0

2015

7.6

1982

6.8

1971

6.5

2017

6.0