Cost and frequency of recent systemic banking crises
Since 1970, the world has seen 147 financial crises in 116 countries. They are shown here by year and by cost (the larger the circle, the larger the fiscal cost of the particular banking crisis). Poor supervision and regulation of banks has consistently led to catastrophic consequences for the nations involved - the most costly being Indonesia's collapse in 1997. Many countries, including the U.S., have faced more than one crisis, and Argentina and the Democratic Republic of Congo have experienced three to four.
Source: Luc Laeven and Fabian Valencia: "Systemic Banking Crises Database: An Update", IMF Working Paper, June 2012