The Central Bank of the Islamic Republic of Iran is responsible for developing and maintaining the Iranian rial, which serves as the country's currency. The government does not recognize trade unions other than the Islamic labour councils, which are subject to the approval of employers and the security services. The minimum wage in June 2013 was 487 million rials a month ($134). Unemployment has remained above 10% since 1997, and the unemployment rate for women is almost double that of the men.