Index,match function trouble with formula

I am trying to write a function with INDEX,MATCH. I have attached a sample worksheet for an example. My first worksheet "employee stats" lists all employees and their number of clients. The adjacent worksheets list the employees separate with a detailed listing of their client load. What I am trying to do is take the total # of clients in sheet 2 (employee 1) which would be cell B22 and have it automatically populate on sheet 1 (employee stats) into the appropriate cell, which in this case for employee 1 would be C4 for current month for employee 1. I hope this makes sense as I have been beating my head against the wall! Thanks in advance for any help you can offer! Thanks so much!!

I am sorry. I am so confused. I am obviously very new to this and am self teaching so please be kind I don't know if I don't understand your reply or if I didn't explain what I was trying to do correctly. Sheet 1 "employee stats" is simply a quick glance sheet to get the employees #'s. The adjacent sheets "Employee 1, Employee 2...." are individual sheets belonging to a certain employee. Each employee has a certain # of clients. I would like the # of clients to automatically populate from the "employee" sheet onto the "employee stats" sheet. For example, Employee 1 currently has 19 clients which shows in Sheet 2 cell B22. When the # of clients change I would like the information in cell B22 to automatically populate over to Sheet 1 in Cell 4. Therefore I will not have to manually enter the change myself. Am I making sense? I really appreciate your time!