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2015 is the answer and its not even in the poll.

2010, 2011, 2012 and 2013 should not even be in the poll. It has no chance of selling 70 million in: 0.75 years, 1.75 years, 2.75 years or 3.75 years. The second 70 million will take a lot longer than the first 70 million. 5 years+ is reasonable