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Rather big drop I must say for a fairly small period but again the last count I believe was a little skewed. All said and done, 1.3 Million is still a rather huge customer base and which can quite easily be expanded upon if Bioware plays their cards right but competition is heating up this year and major releases are just around the corner. Would be interesting how this plays out.
EDIT: Just to clarify, the free one month was handed out in April and the financial statements were done before that.
Here's the link for official source: