Age-Period-Cohort Analysis of Homicides in Mexico Why did the homicide rate start decreasing in Mexico during 1992-1993 and didn’t stop until the start of the drug war? Sources: Population by age - Census - (1980, 1990, 1995, 2000) Population by age - CONAPO (2005 - 2009) Homicide Data - Dirección General de Información en Salud (DGIS). Base de datos de defunciones 1979-2009: Sistema Nacional de Información en Salud (SINAIS). México: Secretaría de Salud.