In the late 1960s and 1970s, commercial paper and bank deposits began to be rated. As well, the major agencies began charging the issuers of bonds as well as investors — Moody's began doing this in 1970 — thanks in part to a growing free rider problem related to the increasing availability of inexpensive photocopy machines, and the increased complexity of the financial markets. Rating agencies also grew in size as the number of issuers grew, both in the United States and abroad, making the credit rating business significantly more profitable. In 2005 Moody's estimated that 90% of credit rating agency revenues came from issuer fees.