2003

6.9

2016

5.9

1980

6.7

1960

7.5

1996

6.7

2014

7.8

1982

6.9

2008

6.8

2010

5.6

2001

6.2

2013

7.9

2015

6.0

2011

6.8

2012

6.0

1962

7.8

2007

6.5

1993

6.6

2003

6.0

2013

7.8

2015

7.3