2006

7.1

2009

7.0

2007

7.5

1993

8.1

1975

8.3

2013

7.5

2008

7.6

2012

7.5

2009

7.6

2017

7.4

1981

8.0

2004

8.2

2005

7.7

2013

6.6

2017

7.6

2018

6.5

2013

7.7

2007

8.0

1972

6.1

2003

8.1