1992

6.8

2011

7.1

2016

5.7

2003

8.2

1993

6.6

2004

8.3

2006

7.5

1976

7.9

2011

8.3

2004

8.0

2004

8.6

2011

7.2

2009

7.6

2005

8.0

2004

7.6

2017

3.8

2014

6.0

2006

8.0