| Date | Bid | Offer |
|---|---|---|
| Apr 30 2012 | R$ 1.9132 | R$ 1.9140 |
| Apr 27 2012 | R$ 1.9213 | R$ 1.9221 |
| Apr 26 2012 | R$ 1.9167 | R$ 1.9176 |
| Apr 25 2012 | R$ 1.9089 | R$ 1.9097 |
| Apr 24 2012 | R$ 1.8994 | R$ 1.9002 |
| Apr 23 2012 | R$ 1.8976 | R$ 1.8984 |
| Apr 20 2012 | R$ 1.8947 | R$ 1.8955 |
| Apr 19 2012 | R$ 1.8998 | R$ 1.9006 |
| Apr 18 2012 | R$ 1.8871 | R$ 1.8879 |
| Apr 17 2012 | R$ 1.8675 | R$ 1.8684 |
| Apr 16 2012 | R$ 1.8323 | R$ 1.8331 |
| Apr 13 2012 | R$ 1.8397 | R$ 1.8404 |
| Apr 12 2012 | R$ 1.8354 | R$ 1.8362 |
| Apr 11 2012 | R$ 1.8222 | R$ 1.8230 |
| Apr 10 2012 | R$ 1.8260 | R$ 1.8268 |
| Apr 09 2012 | R$ 1.8302 | R$ 1.8309 |
| Apr 05 2012 | R$ 1.8428 | R$ 1.8436 |
| Apr 04 2012 | R$ 1.8378 | R$ 1.8386 |
| Apr 03 2012 | R$ 1.8418 | R$ 1.8426 |
| Apr 02 2012 | R$ 1.8459 | R$ 1.8469 |
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.