'Anki - finding success rate by interval

I've been using Anki for about two years now, and have 5,000-odd cards. I am trying to optimise the algorithm and think it would be useful to find out when on average I am most likely to forget cards.

Is there any way of getting stats for at what interval I am most likely to answer 'Again' to a card (maybe through an add-on to statistics or even downloading my data and importing into a spreadsheet)?



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