Top ORO Downloads in April can be found below:
PDF is here 2015-04-Monthly Downloads
March counts (which I forgot to post last month!) are here 2015-03-Monthly Downloads.
What these counts indicate to me is the value that ORO provides to particular faculties (FBL, FELS & IET). These faculties aren’t served by an established subject repository like arxiv or repec. So I’m thinking it’s researchers in these faculties that have the most to gain from an Institutional Repository like ORO.