In December 2000, the IMF stopped aid disbursements due to corruption concerns, and many individual donors followed suit, resulting in an almost 80% drop in Malawi's development budget. However, in 2005, Malawi was the recipient of over US$575 million in aid. The Malawian government faces challenges in developing a market economy, improving environmental protection, dealing with the rapidly growing HIV/AIDS problem, improving the education system, and satisfying its foreign donors that it is working to become financially independent. Improved financial discipline had been seen since 2005 under the leadership of President Mutharika and Financial Minister Gondwe. This discipline has since evaporated as shown by the purchase in 2009 of a private presidential jet followed almost immediately by a nationwide fuel shortage which was officially blamed on logistical problems, but was more likely due to the hard currency shortage caused by the jet purchase. The overall cost to the economy (and healthcare system) is unknown.