The form W-146e is not a commonly recognized or widely-used form in the Internal Revenue Service (IRS) or any other official government organization. Therefore, there is no specific data available on how many people fill out form W-146e each year.
It is possible that form W-146e refers to a form used by a specific organization or company for their own internal purposes. In this case, the number of people filling out the form would be dependent on the policies and requirements of that organization.
To obtain accurate information on the number of people filing form W-146e each year, it would be necessary to clarify the context, purpose, and organization associated with the form.