Modeling Illicit Drug Use Dynamics and Its Optimal Control Analysis

Table 4

Recorded prevalence of illicit drug use for Durban, South Africa.

Year	96b	97a	97b	98a	98b	99a	99b	00a	00b	01a	01b	02a
%	27	31	34	35	33	38	35	40	40	41	42	43
Year	02b	03a	03b	04a	04b	05a	05b	06a	06b	07a	07b	08a
%	42	43.7	44.6	42.1	46	48.9	45.4	48.6	46	50.2	55.2	50.5