a. The official number is ~254,000 (in the USA) which is certainly a major over-estimate. True number is certainly far less.
b. Employees who died or retired don't count as resigned.
Can you point me to your source(s) indicating the lower number you’re referring to?
Then summing the 18-65 buckets (working age).
Can you point me to your source(s) indicating the lower number you’re referring to?