The stated aim is to give a voice to each social group in the multicultural diversity that is Dutch society. The number of hours allocated to each broadcaster corresponds, roughly, to the number of members each organization can recruit (although this does not apply to NOS and NTR – see below). Since 2000, the system has been financed out of general taxation rather than from broadcast receiver licence fees. This is supplemented by a limited amount of on-air advertising (provided by STER), which has been allowed since 1967.