Table 1. National Tuberculosis Prevalence Survey results.

		Year
		1965	1970	1975	1980	1985	1990	1995
Prevalence of latent or active TB infection (<30 years old, %)		44.5	46.9	46.9	41.7	38.7	27.3	15.5
Annual risk of infection		5.3	3.9	2.3	1.8	1.2	1.1	0.5
Prevalence of active TB (≥5 years old)
	Positive radiographic findings (%)	5.1	4.2	3.3	2.5	2.2	1.8	1.03
	Positive culture (%)	0.94	0.74	0.76	0.54	0.44	0.24	0.22
	Positive smear (%)	0.69		0.48	0.31	0.24	0.14	0.09
BCG inoculation rate (<30 years old, %)		24.3	44.4	60.6	69.9	80.1	86.0	91.8

TB, tuberculosis; BCG, Bacillus Calmette–Guérin.