Here is a snapshot of the backstage of the website. You can see some collected numbers. I did use the wayback machine (internet archive) to get that myself. But I have a full database to discover now.
You could actually think the stat page a propose information that should appear on a new SoCiS stats page. This would indeed drive my research in a more focussed manner.
Attached the image with the years and number of projects.
Thanks a lot,