Until December 2006, the same variation was applied to both lines. As of 2007, however, the indigence line has been adjusted to reflect changes in the foodstuffs component of the CPI, whereas the part of the poverty line that corresponds to non-food spending is adjusted to reflect changes in that component of the CPI. From 2007 onwards, therefore, the differential between the indigence and poverty lines is no longer constant. In line with its usual practice, ECLAC made corrections to account for a lack of response to some income-related questions (in the case of wage-earners, self-employed workers and retirees) and for probable biases that stem from underreporting.