private static String getPerformanceRowClass(Double d) {
   String accountCode = ((AcServletData) ScServletData.getLocal()).getAccountCode();
   AcPropertyRegistry pr = AcPropertyRegistries.getAccount(accountCode);
   if (d == null) return null;
   if (d < pr.getPostalScanPerformanceReportMajorPercentage())
     return ScTableConstantsIF.DATA_TABLE_WARNING_MAJOR_CLASS;
   if (d < pr.getPostalScanPerformanceReportMinorPercentage())
     return ScTableConstantsIF.DATA_TABLE_WARNING_MINOR_CLASS;
   return null;
 }