8.0

2016

5.9

1957

7.2

2009

5.6

2011

7.0

1947

7.5

2019

6.3

2006

6.2

1986

6.8

2009

6.7

2009

5.8

1956

7.8

2010

6.1

2005

6.4

2015

5.5

1991

6.5

2002

6.2

1987

4.5

2006

6.5

2011

6.1