1976

7.0

2000

8.2

2014

8.4

1995

8.4

2007

7.3

2006

7.4

1989

6.6

2008

6.3

2016

7.6

1994

8.3

2014

6.5

2017

6.4

2012

6.6

2012

7.2

2017

7.5

2021

8.0

1993

8.0

2013

6.8

2010

8.2

2001

8.5