2013

8.1

1993

7.6

2007

7.7

2009

7.2

2008

7.8

2015

7.8

2009

7.4

1990

7.9

2014

7.9

2005

7.8

2001

8.4

2011

6.3

1963

5.7

2000

6.9

2006

7.4

2015

7.0

1991

7.9

2006

7.8

2004

7.6

2007

7.5