Click here to see the SAS code.
Click here to see the example.

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Using data copy-n-pasted from:
(the copy-n-paste required some manual manipulation, which could possibly be prone to human-error)
http://www.gtz.de/en/themen/29957.htm
http://www.gtz.de/en/themen/30005.htm

2010 data (entered by hand):
http://www.gtz.de/de/dokumente/giz2011-international-fuel-prices-2010-2011-data-preview.pdf


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