The civil aviation industry in India has undergone rapid transformation since liberalization. It has grown from a government-owned industry to one dominated by private airlines. Domestic passenger traffic has increased by 20% annually and is expected to reach 150-180 million by 2020. The top airlines are Jet Airways, IndiGo, SpiceJet and Air India. While Jet Airways and Air India have the largest fleets, IndiGo has the highest passenger and seat occupancy rates due to its low-cost strategy. The industry is regulated by the Ministry of Civil Aviation and other laws and organizations that focus on safety, security, and facilitating growth of the aviation sector.