Hi Jan,
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Sorry, I should have said it is expected to double in six years, not every six years. I think, apart from that one word, the rest of the message is correct. We don't really have data over a long enough timespan to judge beyond that, since I'm only basing this on the last ~3 years of data.
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We can say that the first BigY tests were returned about 9 years 5 months ago, so let's say 3437 days ago. If FTDNA had been processing 47.3 tests per day over that period, we'd have 162570 tests completed and we only have ~113,000. So the throughput at FTDNA is increasing on a decadal timescale, but not by much, and not enough to keep the same doubling timescale.
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Cheers,
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Iain.
