Who Knows?

I was reading over at Amquix.info, and was checking out the growth of Quixtar over the past 30 or so years.

If you go here and go about a third of the way down, you'll see it.

You can see based on that data, Amway spiked hard and up in 1979, then petered out.

If you go to the early-mid 90's, you see a more subdued version of that spike.

Can anyone shed some light on these spikes in growth? I seem to recall Bo Short saying that he had a theory for this, but I have yet to see it.

Any speculation, theory, or suppostition is welcome. I guess I'm really stupid, because I can't account for the spikes.

Thanks for any thoughts, in advance. Still busy, I'll get back to y'all when I can.