Modeling Illicit Drug Use Dynamics and Its Optimal Control Analysis

Table 5

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

Year	96b	97a	97b	98a	98b	99a	99b	00a	00b	01a	01b	02a
%	—	—	—	31	32	33	37	40	40	46	48	46
Year	02b	03a	03b	04a	04b	05a	05b	06a	06b	07a	07b	08a
%	46	47.8	50.7	49.6	49	53.4	48.2	52.5	52.8	54.1	53	53