2008

4.6

2013

5.9

2004

6.2

2014

8.5

2001

7.9

2009

7.6

2017

7.3

2018

7.5

2015

7.3

1994

8.7

2016

7.3

2016

7.9

1940

7.1

2012

6.4

1998

8.1

2003

7.8

2014

7.4

2014

7.9

1980

8.2

1977

8.2