2016 7.6

2014 7.9

2013 7.2

2004 6.4

2007 8.2

1998 8.1

2014 6.3

2016 7.8

2018 7.5

2015 7.7

2017 7.8

2018 5.7

2016 8.0

2014 8.0

1993 8.0

2009 8.3

2007 7.2

2011 8.5

2018 7.0

1988 8.2