This data does not categorize the registrants into Private Sector, Public Sector, Part Time, Retired.
We do not know the Critical Mass. We have a deficiency of Surveyors but we are still functioning. Once we reach a threshold, we will not be able to provide services to the public and a solution will be thrust upon us.
How do we encourage more registrants? This a question that has been asked for years and we need the solution now. The basic answer: Money. Charge more -> Pay more -> Encourage more.
There are thoughts. Surveying is currently a segment of the Civil Engineering profession. There are other professions that could provide candidates: GIS, Remote Sensing (laser scanning / photogrammetry) and Legal (attorneys who do not want to be advocates) have some of the training needed for licensure.