"Between 2005 and 2017, the finance ministry has taken in $706.23 billion dollars in foreign exchange" from oil, it said in a statement.

"A total of $703.11 billion, or 99.5 percent of the amount, has been spent," it said.

Since Prime Minister Haider al-Abadi declared victory over the Islamic State group last December, marking an end to decades of conflict in Iraq, social grievances have boiled over in a series of protests.

After erupting in the oil-rich southern province of Basra on July 8, unrest has quickly spread to several cities, as people have vented their anger over unemployment, high prices, power cuts and a lack of usable water.

Fourteen people have been killed in clashes between security forces and demonstrators, frustrated over the lack of basic services in what has been ranked one of the world's most corrupt countries.

According to parliament the equivalent of $227 billion in public funds in Iraq, OPEC's second largest crude exporter after Saudi Arabia, has gone missing through shell companies.