Count monthly disenrollment

[JHE]

I need count monthly disenrollment  for 2022.

Data table :  

MEMBER_ID	ENROLLMENT	DISENROLLEMNT
A0001	2/1/2021	3/1/2021
A0001	5/29/2021	6/24/2021
A0001	7/1/2021	8/1/2021
B0001	6/3/2021	8/2/2021
B0001	10/1/2021	11/1/2021

How do I have the monthly disenroll , and count by member_ID: as following 

1. Member_ID, Disenroll_Month_Flg 

A0001             202104

A0001             202107

A0001             202209

B0001             202109

B0001             202112

2. Summary: disenroll by month 

month      count: 

202104      1

202107      1

202109      2

202112      1

3. Summery disenroll by member:

Member     Count 

A0001         3

B0001         2

[Astounding]

You don't need to change the data. You just need PROC FREQ to apply a format. For example:

proc freq data=have;
format enrollment yrmon7.;
tables member_id enrollment;
run;

[JHE]

thank you. But if I want count 2021 disenrollment, the rest of the month dose not  enrolled should be counted as disenroll, hwo could I do that   

similar to this ..but it is disenroll. How to ? 

https://communities.sas.com/t5/SAS-Programming/Finding-the-continous-and-discontinous-months-enrollm...