Could you help me?

In Russia, we had a small discussion about Venezuela and gasoline.
I argue that government regulation of gasoline prices leads to a shortage of gasoline.
My opponent claims that under Hugo Chávez there was no shortage of petrol in Venezuela.

Could you, if it doesn’t make it difficult for you, bring me the facts of gasoline shortage under Hugo Chávez or confirm the absence of such facts.

And if you also write an article on this topic, then I will be just immensely happy and grateful to you.

Thank you in advance.

I found only this information:
"
CARACAS -- A sudden spate of largely unexplained shortages of gasoline -- of all things in the country with the biggest oil reserves in the Western hemisphere, or officials claim, the entire world -- has put President Hugo Chávez' government on the spot.

In a country where at least the better off are addicted to driving everywhere (while everybody queues for an ever more unreliable bus or subway train and then sweats through their journey), failure to ensure that people can fill up their tanks at the drop of a hat and with little impact on their pocket is tantamount to serious failure.

Energy and Mines Minister Rafael Ramírez went Thursday to Maracaibo, capital of the western state of Zulia and where shortages were starting to look like becoming acute, in an evident attempt to calm tempers. There, he "guaranteed that supplies would be "regularized" soon but was distinctly short on explanation of what had happened, and why.
"
Source: http://www.laht.com/article.asp?ArticleId=334115&CategoryId=10717