1994

6.3

2010

8.1

2007

8.5

2016

7.7

1960

7.4

1999

8.7

2008

8.9

2015

8.4

2017

8.6

2011

8.6

2014

8.3

2013

8.3

1996

8.5

2017

8.1

2020

8.5

2010

8.1

2006

8.6

2020

8.4

2012

7.8

2008

8.3