Data shown in the "Manufacturing: Subject Series: Concentration Ratios" are replaced due to a display error. The display error showed "zeroes" for values that were "not applicable" in the file, when instead they should have an "X". Display errors have been corrected and the values that are "not applicable" are displayed with the symbol "X". The data were publicly available from 12/17/2010 to 1/11/2011.