ISLAMABAD, Aug 6 (INP) The National Accountability Bureau has recovered Rs 50 billion and deposited in national exchequer during the last three years. According to spokesperson of NAB, the number of complaints, inquiries and investigations during this period is almost double than the previous years. He said that a comprehensive Anti-Corruption Strategy of Awareness, Prevention and Enforcement was launched by NAB to root out corruption from the society by making all the public and private institutions to serve the nation. INP/AH