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[null,"Fecha","Tipo de cambio"]
[null,"2011-01-01",2.78780952380952]
[null,"2011-02-01",2.77115]
[null,"2011-03-01",2.7798695652173899]
[null,"2011-04-01",2.8162631578947401]
[null,"2011-05-01",2.7755714285714301]
[null,"2011-06-01",2.7647142857142901]
[null,"2011-07-01",2.7418947368421098]
[null,"2011-08-01",2.74]
[null,"2011-09-01",2.7443181818181799]
[null,"2011-10-01",2.7324000000000002]
[null,"2011-11-01",2.70561904761905]
[null,"2011-12-01",2.6968947368421099]
[null,"Promedio"]