Please answer a question about the following article about Egypt:

Foreign direct investment (FDI) in Egypt increased considerably before the removal of Hosni Mubarak, exceeding $6 billion in 2006, due to economic liberalisation and privatisation measures taken by minister of investment Mahmoud Mohieddin.[citation needed] Since the fall of Hosni Mubarak in 2011, Egypt has experienced a drastic fall in both foreign investment and tourism revenues, followed by a 60% drop in foreign exchange reserves, a 3% drop in growth, and a rapid devaluation of the Egyptian pound.

How much had FDI increased to in 2006?
$6 billion