It may be interesting to some users to see these statistics. I have aggregated the data from the last few months, running from May 2012 (the creation of the website) up to now. Here is what they show:
The average number of additions is 160 per month, but that number is in steady decline. The reason is not our laziness; as a matter of fact, thanks to contributions the catalog becomes more and more complete - and better and quality, too, so that finding new information is difficult. We are working on additions!