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Instructions provided describe how to symbolize polygons according to what percentage of total area they represent.
Calculate the area of each feature to one field and the total area of all features to a second field. Divide the first field by the second field and place the resulting values into a third field, which is used as the 'Value' field for the layer symbology.
If interested in doing this on subsets of the data, perform a series of 'Select by Attributes' operations. For example, "Land Use = Federal". Do this for each selection set, taking note of the sum for each subset.
For selected subsets, calculate the field values only for the selected records.