Brenden, I believe you will find what Gann has posted there is a logarithmic chart which is widely used when viewing long term data to put percentage moves into the correct perspective.
So there is nothing sinister there, in fact what he has done is the correct way to view long-term data, as any mathematician would advise you.
You can read more about it here:
http://www.fool.com/foolfaq/foolfaqcharts.htm
Kind Regards
Darren
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