1996

7.4

2012

7.1

2010

5.3

2017

6.3

2012

4.8

2013

7.1

2017

6.7

1997

7.7

2001

8.3

2006

4.2

2020

6.6

2005

8.3

1990

7.2

2016

1.8

2004

7.9

2008

0.0

2012

0.0

1979

0.0

2005

8.2

2007

6.9