Registered accounting firms that issue audit reports for more than 100 issuers (primarily public companies) are required to be inspected annually. This is usually around 10 firms. Registered firms that issue audit reports for 100 or fewer issuers are generally inspected at least once every three years. Many of these firms are international non-U.S. firms. In addition, the PCAOB annually inspects at least 5 percent of all registered firms that play a substantial role in the audit of an issuer but that do not issue audit reports for issuers themselves. In 2011, the Board adopted an interim inspection program for the audits of broker-dealers, while the Board considers the scope and other elements of a permanent inspection program.