You can check the integrity of your data on the page to buy the stats ( http://twittercounter.com/pages/buy-stats/RiskInsurance ). I'm afraid (from what I see) it's pretty low for your profile.
In case you think it may still be useful and you want to know the exact dates that we have data for I can send them to you. Just drop an email to support[at]twittercounter[dot]com and I'll provide you with them!
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