| Date | Bid | Offer |
|---|---|---|
| Jul 29 2011 | R$ 1.5555 | R$ 1.5563 |
| Jul 28 2011 | R$ 1.5643 | R$ 1.5651 |
| Jul 27 2011 | R$ 1.5631 | R$ 1.5639 |
| Jul 26 2011 | R$ 1.5337 | R$ 1.5345 |
| Jul 25 2011 | R$ 1.5441 | R$ 1.5449 |
| Jul 22 2011 | R$ 1.5539 | R$ 1.5547 |
| Jul 21 2011 | R$ 1.5559 | R$ 1.5567 |
| Jul 20 2011 | R$ 1.5643 | R$ 1.5651 |
| Jul 19 2011 | R$ 1.5683 | R$ 1.5691 |
| Jul 18 2011 | R$ 1.5820 | R$ 1.5828 |
| Jul 15 2011 | R$ 1.5735 | R$ 1.5743 |
| Jul 14 2011 | R$ 1.5721 | R$ 1.5729 |
| Jul 13 2011 | R$ 1.5754 | R$ 1.5762 |
| Jul 12 2011 | R$ 1.5765 | R$ 1.5773 |
| Jul 11 2011 | R$ 1.5788 | R$ 1.5796 |
| Jul 08 2011 | R$ 1.5626 | R$ 1.5634 |
| Jul 07 2011 | R$ 1.5573 | R$ 1.5581 |
| Jul 06 2011 | R$ 1.5654 | R$ 1.5662 |
| Jul 05 2011 | R$ 1.5629 | R$ 1.5637 |
| Jul 04 2011 | R$ 1.5572 | R$ 1.5580 |
| Jul 01 2011 | R$ 1.5591 | R$ 1.5599 |
Source: Brazilian Central Bank
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Ptax is the main reference rate for the US Dollar in Brazil. It's published daily by the Brazilian Central Bank based on the quotes received from the major foreign exchange dealers in the Brazilian market. It's released by 1 PM (GMT-3) every business day.