2006

7.7

2014

7.3

1995

7.8

2005

8.3

2007

7.0

2009

7.4

2001

7.6

1993

5.6

2008

7.1

1976

7.8

1997

6.3

2012

6.9

2004

8.1

1966

7.2

2016

6.6

2008

6.5

2016

7.0

1981

8.0

2013

6.0

2009

6.8