2018

5.9

2009

5.3

1970

6.4

2016

4.9

1975

7.2

2012

4.9

2016

5.9

1984

7.1

1991

5.6

1989

6.5

1986

6.8

2001

5.2

2010

6.5

2011

5.5

2015

6.6

2006

4.3

1991

6.4

2017

6.9

2006

6.9

1947

7.5