for the period from June 1, 1981, through May 31, 1982, based on different levels of experience. At the urging of the D.C. Circuit in its en banc decision in Save Our Cumberland Mountains v. Hodel, supra, 857 F.2d at 1525, the matrix was updated through May 31, 1989, in connection with a settlement reached on remand in that case. See, e.g., Trout v. Ball, 705 F. Supp. 705, 709, n. 10 (D.D.C. 1989)(the updated matrix developed in Save Our Cumberland Mountains v. Hodel “does provide an updated and accurate schedule of attorney fees in this District”). The applicant for a fee award must establish the prevailing market rates. To establish the prevailing market rates in the District of Columbia, the applicant "may point to such evidence as an updated version of the Laffey Matrix or the U.S. Attorney’s Office matrix, or their own survey of prevailing market rates in the community." Covington v. District of Columbia, 57 F.3d 1101, 1109 (D.C. Cir. 1995). Fee applicants often point to the Laffey Matrix. Over the years, two methods of adjusting the Laffey Matrix for the passage of time have developed: the U.S. Attorney's Office Laffey Matrix and the Legal Service Index-Adjusted Laffey Matrix. These methods produced different hourly rates due to the use of different inflation metrics. The U.S. Attorney's Office for the District of Columbia also developed a new matrix in 2015, but it was rejected by the court of appeals for the D.C. Circuit. U.S. Attorney's Office Laffey Matrix For many years, the United States Attorney's Office used the Laffey Matrix ("USAO Laffey Matrix") as a basis for hourly rates for attorneys' fees in litigation claims. This matrix used the original Laffey Matrix from 1982 and adjusted it annually using changes in the Bureau of Labor Statistics Consumer Price Index for all Urban Consumers for the Washington-Baltimore area. The result was a routinely adjusted United States Attorney's Office Matrix: a table which provided hourly rates, based on years of experience, for attorneys, paralegals and law clerks in the Washington, D.C. area. In 2015, the USAO revised its method. Its matrix is no longer based on the Laffey Matrix. Its matrix is now based on data from a 2010-2011 ALM survey adjusted using the Producer Price Index-Office of Lawyers (PPI-OL) index (the "USAO Matrix"). The USAO Matrix is based on rates for all types of legal services, not exclusively complex