2015

5.7

2013

5.0

2012

6.2

1992

6.3

2002

4.6

2010

7.0

1973

9.2

2018

6.2

2013

5.7

1996

6.2

2006

4.6

2004

6.0

1965

7.1

2002

9.1

2017

5.0

2002

5.8

1991

5.3

2016

4.1

2009

5.4

1997

6.2