| Date | Bid | Offer |
|---|---|---|
| May 31 2012 | R$ 0.2780 | R$ 0.2782 |
| May 30 2012 | R$ 0.2775 | R$ 0.2776 |
| May 29 2012 | R$ 0.2764 | R$ 0.2765 |
| May 28 2012 | R$ 0.2762 | R$ 0.2764 |
| May 25 2012 | R$ 0.2792 | R$ 0.2793 |
| May 24 2012 | R$ 0.2847 | R$ 0.2849 |
| May 23 2012 | R$ 0.2893 | R$ 0.2894 |
| May 22 2012 | R$ 0.2877 | R$ 0.2879 |
| May 21 2012 | R$ 0.2856 | R$ 0.2858 |
| May 18 2012 | R$ 0.2796 | R$ 0.2797 |
| May 17 2012 | R$ 0.2771 | R$ 0.2774 |
| May 16 2012 | R$ 0.2790 | R$ 0.2792 |
| May 15 2012 | R$ 0.2796 | R$ 0.2798 |
| May 14 2012 | R$ 0.2824 | R$ 0.2826 |
| May 11 2012 | R$ 0.2809 | R$ 0.2811 |
| May 10 2012 | R$ 0.2823 | R$ 0.2825 |
| May 09 2012 | R$ 0.2848 | R$ 0.2850 |
| May 08 2012 | R$ 0.2825 | R$ 0.2827 |
| May 07 2012 | R$ 0.2824 | R$ 0.2826 |
| May 04 2012 | R$ 0.2817 | R$ 0.2819 |
| May 03 2012 | R$ 0.2851 | R$ 0.2852 |
| May 02 2012 | R$ 0.2837 | R$ 0.2838 |
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.