2013

7.8

1999

6.9

2012

7.2

1991

5.2

2013

7.6

2010

7.2

1984

8.1

2008

8.5

2012

5.6

2013

6.9

2013

6.0

2001

7.9

1968

7.7

2012

5.7

2014

8.0

2012

0.0

2011

0.0

2010

2.0

2007

2.0

2004

2.0