2013

6.5

1999

8.0

2013

6.8

2014

5.7

2009

4.8

2008

6.2

2011

9.5

2013

6.3

1961

7.2

1981

5.6

2010

6.0

2011

6.7

2011

5.9

2012

5.4

2004

5.7

2001

7.1

2013

7.3

1984

6.9

2009

7.3

2012

7.3