Year/ Frozen ID: 
This is in regard to the profile records. Every time a change is made to the data, a new record is created and the old profile record moves to history.  Zero is the current record. A plus (+) indicates that there is an additional profile associated with a sale of the property, while a minus (-) indicates that a different profile record exists due to maintenance. Maintenance is performed when land is cleared or land use changes occur.
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