The MTA in New York City stated that 917 counterfeit bills were used to purchase MetroCards in 2012. The face value of the counterfeit dollars was $19,060.
In 2011, a total of 975 counterfeit bills valued at $30,232 were used in NYC to purchase MetroCards.
Source: Michael Gartland, “MTA clerks forced to pay for accepting counterfeit bills,” New York Post, March 24, 2013.