 After the 1979 Islamic Revolution, all banks had to follow Sharia banking procedures, including the forbidding of interest (riba) and the forbidding of usury.The Supreme Audit Court of Iran regulates banking and financial operations.In recent years, Iran has created free trade zones, such as on Kish Island and the port of Chabahar where such rules are not applied in order to stimulate investment, similar to other Muslim countries.