






















EveryCRSReport.com
The Congressional Research Service (CRS) is a federal legislative branch agency, housed inside the 
Library of Congress, charged with providing the United States Congress non-partisan advice on 
issues that may come before Congress.
EveryCRSReport.com republishes CRS reports that are available to al  Congressional staff. The 
reports are not classified, and Members of Congress routinely make individual reports available to 
the public. 
Prior to our republication, we redacted names, phone numbers and email addresses of analysts 
who produced the reports. We also added this page to the report. We have not intentional y made 
any other changes to any report published on EveryCRSReport.com.
CRS reports, as a work of the United States government, are not subject to copyright protection in 
the United States. Any CRS report may be reproduced and distributed in its entirety without 
permission from CRS. However, as a CRS report may include copyrighted images or material from a 
third party, you may need to obtain permission of the copyright holder if you wish to copy or 
otherwise use copyrighted material.
Information in a CRS report should not be relied upon for purposes other than public 
understanding of information that has been provided by CRS to members of Congress in 
connection with CRS' institutional role.
EveryCRSReport.com is not a government website and is not affiliated with CRS. We do not claim 
copyright on any CRS report we have republished.