However, depending on the statistical method used for forest area and forest type classification, available data on forest structure may differ. The 2005 Law on Forests and the Forestry Service determines the total forest fund areas to be 1,498,957 ha. In the high forest stands the first four age classes (trees aged between 0 and 80 years) are predominant, accounting for as much as 65 per cent of the high forest surface, with 48 per cent of tree stands aged below 60 years.