1996

7.4

2014

7.6

2017

7.9

2012

7.6

2014

7.1

2002

7.5

2015

7.4

2017

7.5

2015

7.5

2003

8.2

2001

6.8

2013

8.6

2001

8.0

2019

7.7

1960

7.4

2012

6.2

2013

7.3

2016

7.2

2011

8.1

2009

6.8