How is that US$642.5b calculated? IIRC in 2015 we had at least two values for the dollar/pesos ratio. The official one was like 10AR$/US$, but you could buy a small amount of dollars at that value. And the street value (so called "blue dolar") was like 15AR$/US$. So which one was used? It's like a 50% difference.

(Now we had like 10 definitions of the dollar/pesos ratio. The official one is 950AR$/US$ but it's almost imposible to buy at that price. To buy dollars, the prices are around 1300AR$/US$ or 1500AR$/US$ depending on the day of the week.)