Statistics special report on special education teachers the percentages are averages of the 50 states and the District of Columbia , but this type of data for the 1998-1999 school year was not reported in the 2001 report . Table 1 . Percentages of Retained Teachers Who Were and Were Not Fully Certified From 1993-1994 to 1998-1999 . Note . ``0 ' indicates that data were not reported in the annual reports Source : Source : Conroy , Katsiyannis Zhang (2003 , p . 246 ) Further complicating the problem for policymakers...











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