Calculating TOTAL by dimension

[inmemoryofER]

I have a table with two dimensions, store and year. I want to take a count of distinct employees at each store and calculate the percentage of employees at each store segmented by year. So in the table below, in 2018 store A had 6 of the total 17 distinct employees, which comes out to about 35%. I tried using the following expression: (Count(DISTINCT EMPLOYEES)/Count(TOTAL DISTINCT EMPLOYEES)), but the denominator is incorrect here because it returns a count of total distinct employees across all years.

Store	Year	Count(Distinct Employees)	**Desired Calculation**
A	2018	6	6/17 = .35
B	2018	4	4/17 = .24
C	2018	7	7/17 = .41
A	2019	8	8/27 = .30
B	2019	7	7/27 = .26
C	2019	12	12 / 27 = .44
A	2020	5	5 / 26 = .19
B	2020	7	7 / 26 = .27
C	2020	14	14 / 26 = .54

[maxgro]

try with 

Count(TOTAL <year> DISTINCT EMPLOYEES))