| Date | Bid | Offer |
|---|---|---|
| Jul 31 2012 | R$ 2.1009 | R$ 2.1016 |
| Jul 30 2012 | R$ 2.0712 | R$ 2.0719 |
| Jul 27 2012 | R$ 2.0767 | R$ 2.0775 |
| Jul 26 2012 | R$ 2.0704 | R$ 2.0713 |
| Jul 25 2012 | R$ 2.0607 | R$ 2.0615 |
| Jul 24 2012 | R$ 2.0497 | R$ 2.0504 |
| Jul 23 2012 | R$ 2.0600 | R$ 2.0608 |
| Jul 20 2012 | R$ 2.0501 | R$ 2.0510 |
| Jul 19 2012 | R$ 2.0648 | R$ 2.0656 |
| Jul 18 2012 | R$ 2.0675 | R$ 2.0682 |
| Jul 17 2012 | R$ 2.0724 | R$ 2.0733 |
| Jul 16 2012 | R$ 2.0808 | R$ 2.0815 |
| Jul 13 2012 | R$ 2.0707 | R$ 2.0715 |
| Jul 12 2012 | R$ 2.0791 | R$ 2.0800 |
| Jul 11 2012 | R$ 2.0701 | R$ 2.0710 |
| Jul 10 2012 | R$ 2.0742 | R$ 2.0749 |
| Jul 09 2012 | R$ 2.0789 | R$ 2.0801 |
| Jul 06 2012 | R$ 2.0811 | R$ 2.0819 |
| Jul 05 2012 | R$ 2.0917 | R$ 2.0924 |
| Jul 04 2012 | R$ 2.1058 | R$ 2.1067 |
| Jul 03 2012 | R$ 2.0889 | R$ 2.0897 |
| Jul 02 2012 | R$ 2.0833 | R$ 2.0843 |
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.