INDEC and UCA are indeed two different sources, but the only part of Reuters' article that uses INDEC as source is the graph (which they did themselves, for INDEC do not publishes in english). So I concentrate on UCA because besides the graph all information cited comes from it, and it's more telling to have that contrast of the source with itself, and UCA is not a state dependency, which INDEC is and thus I assume you will trust less.