After the Revolution, the composition of the middle class in Iran did not change significantly, but its size doubled from about 15% of the population in 1979 to more than 32% in 2000. The official poverty line in Tehran for the year ending March 20, 2008, was $9,612, while the national average poverty line was $4,932. In 2010, Iran's Department of Statistics announced that 10 million Iranians live under the absolute poverty line and 30 million live under the relative poverty line.