The forest districts pay into this fund in amounts that vary by district, in accordance with prevailing local natural and economic conditions. The fund balance has increased in recent years and stood at PLN 800 million at the end of 2012 (Table 4.8). In other words, it finances deficits incurred by forest districts that are disadvantaged because of unfavourable natural or economic conditions - for example, a predominance of tree stands that are too young to be harvested.