By Ben Tavener, Senior Contributing Reporter
RIO DE JANEIRO, BRAZIL – Second biggest petroleum company in Brazil, OGX, has fared the worst in terms of market value so far in 2012 of Brazil’s 295 companies publicly-traded on the São Paulo Bovespa stock exchange. Still the Bovespa has witnessed encouraging growth of R$147 billion (US$72 billion) this year, according to consultancy Economatica, who released its analysis of the year . . .