Angola's financial system is maintained by the National Bank of Angola and managed by the governor Jose de Lima Massano. According to a study on the banking sector, carried out by Deloitte, the monetary policy led by Banco Nacional de Angola (BNA), the Angolan national bank, allowed a decrease in the inflation rate put at 7.96% in December 2013, which contributed to the sector's growth trend. Estimates released by Angola's central bank, said country's economy should grow at an annual average rate of 5 per cent over the next four years, boosted by the increasing participation of the private sector.