The following abbreviations and symbols are used throughout the tables.

Blank	no special conditions associated with the data cell
B	data not available due to brackets
D	data withheld to avoid disclosing information for individual farms
H	standard error or relative standard error of estimate is greater than or equal to 99.95 percent
L	standard error or relative standard error of estimate is less than .05 percent
N	data not available or not published
S	withheld because estimate did not meet publication standards on the basis of either the response rate or a consistency review
X	data not applicable
Z	less than half of the unit reported
-	data item is a negative number
cwt	hundredweight
sq ft	square feet