What (a) total number of students who are National Student Financial Aid Scheme (NSFAS) beneficiaries (i) registered and (ii) completed their studies at institutions of higher learning in each of the past five academic years, (b) was the dropout rate of NSFAS-funded students in each of the specified academic years and (c) has he found to be the average dropout rate of NSFAS-funded students since the inception of the NSFAS?