How many credit card transactions per year in the US?
21.7 billion in 2006. Source: http://www.frbservices.org/files/communications/pdf/research/2007_payments_study.pdf
Credit card users should check their monthly statements for fraudulent or suspicious charges. Credit users should obtain their credit reports once a year, for free, and review the reports for unknown / unrecognized transactions or applications for credit. All persons should protect their personally identifying information.