1980

5.9

2016

6.7

2011

5.0

2011

7.3

1964

7.4

2006

5.7

1955

7.2

2007

5.7

0.0

2013

4.8

1972

6.6

1993

6.8

7.8

2001

7.2

2004

6.0

2010

6.6

2013

8.1

2014

6.8