Yes. Projections and simple math. Both of which you apparently have no idea how to do.

For someone on the lower end of the intelligence scale like yourself, let me give you a crash course here. Simply take the amount of flows each month and divide them with the amount on the seniority list and voila, there is your projected flow date. This is where you come up where you stand in the flow, i.e. 5 years from date of hire or 5 years and 9 months from date of hire, etc.