###HUMAN: Find the number of the enrollment date for all the tests that have 'Pass' result, and could you order x axis from high to low order please?, ###ASSISTANT: SELECT date_of_enrolment, COUNT(date_of_enrolment) FROM Student_Course_Enrolment AS T1 JOIN Student_Tests_Taken AS T2 ON T1.registration_id = T2.registration_id WHERE T2.test_result = "Pass" GROUP BY date_of_enrolment ORDER BY date_of_enrolment DESC