This map in the New York Times gives a snapshot of global migration in 2007. One of the options on the map allows you to show money sent home as a percentage of national GDP i.e. ‘remittances economies’. Looks like Moldova is the remittances economy, with money sent home equalling almost 30% of GDP. However, we’re not talking big bucks: remittances to Moldova totalled about $900m.
There are lots of other fascinating snapshots of global migration patterns contained within this New York Times piece.