1955 7.3

2018 6.9

2012 7.1

2015 6.1

2011 6.9

2003 7.0

1990 7.1

2016 7.0

2017 6.4

2018 7.5

2016 6.2

2009 7.0

2018 7.1

1997 3.8

2011 6.8

2011 7.0

1999 6.5

2008 6.2

2016 7.8

2005 8.0