1968

6.4

1973

7.7

2011

6.1

2015

8.8

2014

6.2

2013

5.4

1996

5.7

2012

5.5

2006

7.8

1923

7.5

2013

8.1

2001

4.3

1979

6.6

2013

5.5

2005

5.2

2014

6.6

1987

6.0

1895

5.6