Year Plus data relates to ebooks that have been on sale for one year or longer. The current trend seem to be Ellora's Cave holding pretty stable, Samhain sales are still heading upwards. Loose Id also keeps drifting upward.
That means that, based on current EREC data the top selling erotic romance epublisher is Samhain, followed by Ellora's Cave, Liquid Silver, Loose Id and Cobblestone.
I am pretty short on data for any press that does not appear on this graph. Please link of me next time you are updating your sales records.