2010

6.1

2016

8.2

2013

8.0

2009

7.4

1982

7.9

1990

7.5

2016

7.0

1987

7.3

2015

6.8

1988

7.3

2005

6.7

1994

8.7

2007

7.2

1990

7.7

2014

6.5

2005

8.1

2001

8.5

2016

5.9

1970

7.3

2012

6.6