a. Basis of Presentation

Until December 31, 1995, publicly-traded companies in Brazil were required to prepare financial statements pursuant to two methods: (i) the corporate law method, which was and remains valid for all legal purposes, including the basis for determining income taxes and the calculation of mandatory minimum dividends; and (ii) the constant currency method, to present supplementary price-level adjusted financial statements, pursuant to standards prescribed by the Brazilian Securities Commission (CVM).