~13% of the fraction of the country that is formally employed earns minimum wage[1]... just not usually people in any sort of specialized profession working in cities.
[1] (in Spanish) http://www.milenio.com/politica/salario_minimo-aumento_salar...
[1] (in Spanish) http://www.milenio.com/politica/salario_minimo-aumento_salar...