1992

6.8

2014

8.3

2010

7.8

2014

7.6

2015

8.0

1971

8.1

2013

7.9

2008

8.9

2020

7.6

2014

8.5

1997

7.3

2012

7.5

2013

7.5

2006

7.7

2010

7.1

1994

8.2

2013

8.0

2021

7.6

1995

7.7

2010

8.0