| Date | Bid | Offer |
|---|---|---|
| Jun 29 2012 | R$ 0.3443 | R$ 0.3444 |
| Jun 28 2012 | R$ 0.3495 | R$ 0.3497 |
| Jun 27 2012 | R$ 0.3478 | R$ 0.3480 |
| Jun 26 2012 | R$ 0.3479 | R$ 0.3481 |
| Jun 25 2012 | R$ 0.3477 | R$ 0.3478 |
| Jun 22 2012 | R$ 0.3468 | R$ 0.3469 |
| Jun 21 2012 | R$ 0.3447 | R$ 0.3448 |
| Jun 20 2012 | R$ 0.3466 | R$ 0.3468 |
| Jun 19 2012 | R$ 0.3489 | R$ 0.3490 |
| Jun 18 2012 | R$ 0.3491 | R$ 0.3492 |
| Jun 15 2012 | R$ 0.3474 | R$ 0.3475 |
| Jun 14 2012 | R$ 0.3509 | R$ 0.3510 |
| Jun 13 2012 | R$ 0.3491 | R$ 0.3492 |
| Jun 12 2012 | R$ 0.3452 | R$ 0.3453 |
| Jun 11 2012 | R$ 0.3421 | R$ 0.3422 |
| Jun 08 2012 | R$ 0.3416 | R$ 0.3418 |
| Jun 06 2012 | R$ 0.3402 | R$ 0.3403 |
| Jun 05 2012 | R$ 0.3390 | R$ 0.3392 |
| Jun 04 2012 | R$ 0.3430 | R$ 0.3431 |
| Jun 01 2012 | R$ 0.3400 | R$ 0.3401 |
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.