Determining promo codes from paid downloads in itunes connect

Hey all, when viewing my daily sales figures in itunes connect I am told how many paid and free apps I've sold daily, but how do I tell from the paid apps whether they were purchased or downloaded with a promo code? I've sent a lot of promos out this week so I'm now not sure whether my daily paid figue is actually sales or people checking these promos out. Any ideas? Cheers.
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