Of these, (Table 1.18) professors comprise 11.4%, associate professors 24%, senior lecturers, constituting the bulk with 729 or 52.8%, and lecturers numbering 163 or only 11.8% of total academic staff. Lecturers with PhDs are promoted after three years and the effect of this service regulation has served to increase the number of Senior Lecturers. However, non-academic staff (Table 1.20) increased from 3 921 to 7 317 over the same period giving in 2009 a proportion of 20.7% academic staff to a surprising 79.3% of non-academic staff in 2009.