Koperasi Angkutan Jakarta or Kopaja (Jakarta Transport Cooperative) is a cooperative established in 1971 to provide public transport services in Jakarta. There were reportedly over 1,400 minibuses in the Kopaja fleet in mid-2012, more than half of which were estimated to be over 20 years old. It is not uncommon for buskers, often children, to jump aboard the Kopaja minibuses. However apart from hoping for a small contribution they rarely cause any trouble at all to passengers.