1992

7.2

2016

6.0

2009

7.6

2014

8.5

2012

7.2

2017

8.2

1994

8.7

1997

7.9

1999

8.0

2014

7.8

1972

8.7

2014

7.7

2004

8.4

1994

8.3

2006

7.4

2016

6.5

2018

8.4

2005

6.9

2011

7.3

2016

7.4