| Date | Bid | Offer |
|---|---|---|
| May 31 2013 | R$ 0.3633 | R$ 0.3636 |
| May 29 2013 | R$ 0.3542 | R$ 0.3544 |
| May 28 2013 | R$ 0.3505 | R$ 0.3507 |
| May 27 2013 | R$ 0.3511 | R$ 0.3514 |
| May 24 2013 | R$ 0.3512 | R$ 0.3515 |
| May 23 2013 | R$ 0.3519 | R$ 0.3521 |
| May 22 2013 | R$ 0.3505 | R$ 0.3507 |
| May 21 2013 | R$ 0.3522 | R$ 0.3524 |
| May 20 2013 | R$ 0.3480 | R$ 0.3482 |
| May 17 2013 | R$ 0.3468 | R$ 0.3471 |
| May 16 2013 | R$ 0.3480 | R$ 0.3482 |
| May 15 2013 | R$ 0.3454 | R$ 0.3456 |
| May 14 2013 | R$ 0.3450 | R$ 0.3453 |
| May 13 2013 | R$ 0.3473 | R$ 0.3475 |
| May 10 2013 | R$ 0.3475 | R$ 0.3477 |
| May 09 2013 | R$ 0.3485 | R$ 0.3487 |
| May 08 2013 | R$ 0.3483 | R$ 0.3486 |
| May 07 2013 | R$ 0.3441 | R$ 0.3443 |
| May 06 2013 | R$ 0.3451 | R$ 0.3454 |
| May 03 2013 | R$ 0.3466 | R$ 0.3468 |
| May 02 2013 | R$ 0.3461 | R$ 0.3465 |
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.