Dzongkha is partially intelligible with Sikkimese and spoken natively by 25% of the population. Tshangla, the language of the Sharchop and the principal pre-Tibetan language of Bhutan, is spoken by a greater number of people. It is not easily classified and may constitute an independent branch of Tibeto-Burman. Nepali speakers constituted some 40% of the population . The larger minority languages are Dzala (11%), Limbu (10%), Kheng (8%), and Rai (8%). There are no reliable sources for the ethnic or linguistic composition of Bhutan, so these numbers do not add up to 100%.