Replying to my own question here with some responses from USGBC:

Re, the numbers I listed, confidential projects are not included in the Certified and Registered lists on the USGBC website. So these numbers are a bit low.

Re, my growth question, USGBC says, "We do not have figures on the growth of EB O & M projects as of now. WE are working on a more wholistic approach towards project data and will be having lot more flexibility to conduct analysis on these project numbers."

... this seems a touch odd given the slick growth graph that USGBC now features on their home page. Alas, it is in SF, incorporates all projects, and only covers the past week.