B-to-B E-Commerce Sales

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We're a B-to-B distributor who's benchmarking our site. I'm trying to get e-commerce stats on other B-to-B companies, specifically the % of sales they make over their web site. While a few companies provide this info publicly, which our company does, most do not.

I'd appreciate hearing about any web sites or other forums/groups where I can get access to this type of info. Thanks