Using your formula, my percentage is 34%.
But actually, I think to get the accurate numbers I think you'll have to use JUST the hits you've gotten within Etsy. So take your "etsy.com" hits under "traffic sources" and divide that by your search numbers. Basically using JUST your etsy.com numbers, not your direct traffic, other sources, etc.
So for me, 74% of my hits have been from within Etsy (the other 26% is direct traffic, Google, Facebook, etc). And 45% of my hits from within Etsy are from search.