It has been estimated that roughly 1.6 trillion USD in criminal proceeds are laundered through the international financial system each year. To put this in perspective, this sum is more than the combined GDPs of Switzerland, Portugal, Romania, Belarus, and Austria in 2011.
Publication
Working Paper 14: Using money laundering investigations to fight corruption in developing countries
Anti-money laundering systems have the potential to curb the use of proceeds of corruption and other crimes by the perpetrators. An effectively implemented anti-money laundering framework limits the channels through which illicit funds can be laundered, making crime riskier and reducing the incentives for corrupt activities.