2013

7.0

2009

7.9

2014

7.8

2013

8.1

2007

7.6

1992

7.1

2005

5.5

2012

5.4

2016

4.9

2015

6.6

2004

6.0

2001

6.2

2015

8.0

1998

6.2

2009

6.6

2012

7.7

2013

5.7

1969

8.3

2017

6.2

2001

6.0