Danno, I'm not sure I'd create a new catalog every year... I haven't seen any improvement in performance with a catalog with only 10,000 images versus one with 100,000 or so. I know of others with over a million images in a single catalog. But, I, and most of those folks are using SSDs for the catalog and multiple, fast drives in RAID 0 configurations to speed access.
Having each year in a separate catalog makes searches really limited unless you're looking by date... At least for me it would since I largely search by keyword and there may be images from any of 10+ years that fit the keywords. It would be nice if Lightroom would allow searching across catalogs, but until they do (which I suspect they won't), I generally recommend to people that choose to organize by date (ignoring the umpteen entries on the Internet that claim it's a terrible way to organize) to use a single catalog and just use a folder structure based on year/month or year/month/day... But, as always, everybody does things slightly differently, to fit what works best for them.