(29)Initially, the calculations of reference values and of the quota allocation to individual producers and importers were based on the quantities of HFCs that they reported as having been placed on the market during the reference period from 2009 to 2012. Nevertheless, in order not to exclude undertakings from entering the market or from expanding their activities, a smaller part of the overall maximum quantity should be reserved for producers and importers that have not previously placed HFCs on the market and for producers and importers that have a reference value and wish to increase their quota allocation.