-88888: Missing data but would expect unit to have reported.
-77777: Used for county-level units that were not included in 1990 census.
-66666: Used for Hongkong, Macao, Taiwan and islands under Taiwan administration.
-44444: Water body not under county-level administration (eg., Qinghai Lake).
-33333: Diaoyu dao, Huangwei yu and Chiwei yu.
-22222: Missing data (agricultural) though unit has relatively little agriculture, so absence not surprising (in contrast to -88888's).
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