Prior to 2009, land was simply tracked as disturbed, reclaimed or certified.  The Active Land graph shows these three categories, cumulatively over time.  The Disturbed category included any land cleared of trees and vegetation, as well as land where there was any amount of soil disturbance.  The Reclaimed category included any land considered either temporarily or permanently reclaimed.  Permanent reclamation may have included lands at various stages of reclamation - for example, where soils had been placed but vegetation had yet to be planted.  In 2008 104 ha of land was certified as reclaimed and returned to the Crown.