One caution is that this assessment is based on the 30 December FAA registry. It's possible the FAA will de-register a bunch of airplanes as of 31 December. I'll check the next time they update the downloadable file.
Edit: Looking at past years, they don't seem to do that (de-register a bunch of airplanes on the last day or the year). For instance, only three were de-registered on the last week of December 2018.
Ron Wanttaja