As an illustration, nearly 50% of those in the second-poorest strata are in the two richest income quintiles, up from 31% in 2003. Anecdotal evidence suggests that measurement has been altered to widen access to subsidies for political purposes. This calls for a more systematic cross-checking of information, e.g. by using a unique identification number such as the cedula for all social and tax purposes. The Sisben is updated every 3 years, which may not be often enough to reflect changes in the personal situation (e.g. loss of job).