2009

7.1

2010

6.8

2012

7.8

2011

6.3

2014

6.6

2015

7.3

2013

6.9

1967

6.6

2011

7.0

1978

6.2

2006

5.9

1999

5.9

2014

7.7

1990

5.8

2009

6.9

2012

7.3

2005

6.8

1983

7.3

2014

6.1

2005

6.9