Angola was a Portuguese colony from the 16th century to 1975. The country is the second-largest petroleum and diamond producer in sub-Saharan Africa, yet its people are among the continent's poorest. According to the International Monetary Fund, more than $4 billion in oil receipts have disappeared from Angola's treasury in the 2000s. LGBT rights in Angola are very limited. Homosexuality has been against the law in Angola since colonial times under Portuguese law. Homosexuality is according to the law "an offence against the public moral" and therefore prohibited.