Australia has no official language, but is largely monolingual with English being the de facto national language. It is believed that there were almost 400 Australian Aboriginal languages at the time of first European contact. Only about 70 of these languages have survived and all but 30 of these are now endangered. An indigenous language remains the main language for about 50,000 (0.25%) people. Australia has a sign language known as Auslan, which is the main language that approximately 10,000 deaf people use.