WITH RSLT AS ( 
    SELECT
        (SELECT MIN(MONTHLY) FROM MRR_DATA) AS YM
        , 0 AS MRR 
    UNION ALL 
    SELECT
        DATE (YM, '+1 month')
        , MRR + ((SELECT NEW_MRR + EXPANSION_MRR - DOWNGRADE_MRR - CHURN_MRR FROM MRR_DATA WHERE MONTHLY = YM ) ) 
    FROM RSLT 
    WHERE YM < DATE ((SELECT MAX(MONTHLY) FROM MRR_DATA), '1 month')
) 
SELECT * 
FROM RSLT
ORDER BY YM ASC;