Production was 1.8m/month (21.6m/yr) for most of 2007 and the beginning of 2008.
Then they ramped it up to 2.4m/month (28.8m/yr). That's EXACTLY a 33% increase.
If they increase by 33% again in March, that'll bring it to 3.2m/month, or 38.4/year.
38.4 for nine months (38.4 * (9/12)) = 28.8.
52m by the end of March + 28.8m for the remainder of 2009 = 80.8 million units shipped by January 1, 2010.
Given the Wii sellthrough rate, I'd estimate that no less than 78m of those 80.8 million will be sold by January 1, 2010.
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