First off welcome aboard to CCC.
Your only hope is Galen Govier, but be wary of his ways!!
As CP said know one know's exactly, the % numbers is as close as we can get and then there's always the, "How many still exist?" question which is even harder to answer
That's why it's great with these e-bodys there ALL rare, some more than others
Type in DY3 Coloured Challenger on eBay and see how many you can find, I'm sure in one of those someone will say, "This is 1 out of ###" etc, then just email him to see how true he is and how he found out
Hope that helps, let us know how you get on.