1984 7.3

2017 6.3

2015 8.1

1992 8.2

2004 8.1

2010 7.0

2003 6.3

2016 7.1

2016 6.7

2006 8.0

2017 5.2

2018 6.7

2015 7.6

2013 7.7

2016 7.2

1980 7.7

2010 7.5

2004 5.7

1989 7.5

2018 6.6