Finance minister Arun Jaitley said, Directorate of Revenue Intelligence (DRI) has actually evolved with changing nature of country's economy. <br/><br/>Speaking at a function to celebrate the Diamond Jubilee of the DRI, Mr Jaitley complimented the organisation for investigation success rate. He said, it is important for institution like DRI to continue to upgrade its skills. <br/>'<br/>Martyrs were also honoured on the occasion.