ABBREVIATIONS AND SYMBOLS

The following abbreviations and symbols are used in this publication:

 -      Represents zero.
(A)     Standard errors of 100 percent or more.
(D)     Withheld to avoid disclosing data for individual companies; data
        are included in higher level totals.
(NA)    Not available.
(NC)    Not comparable.
(S)     Withheld because estimate did not meet publication standards.
(X)     Not applicable.
(Z)     Less than half the unit shown.
n.e.c.  Not elsewhere classified.
n.s.k.  Not specified by kind.
pt.     Part.
 r      Revised.
SIC     Standard Industrial Classification.