Jhabua and Alirajpur districts have more than 50% tribal population, with Jhabua and Alirajpur having nearly 90% tribal population. In Khargone, Khandwa, Burhanpur, Betul, Chhindwara, Seoni, Anuppur, Umaria, Shahdol and Singrauli districts 30–50% of the population is tribal. According to the 2011 census, the tribal population in Madhya Pradesh was 15.34 million, constituting 21.1% of the total population. There were 46 recognised Scheduled Tribes and three of them have been identified as "Special Primitive Tribal Groups" in the State. Madhya Pradesh ranks(33rd) on the Human Development Index value of 0.606 (2018). According to the SDG India Index 2020–21 compiled by the NITI AAYOG, Madhya pradesh ranks 21 on sustainable development goals. The state's per-capita gross state domestic product (nominal GDP) is the 26th in the country (2018–19). According to NITI Aayog SDGs India index the state ranks 9th on gender equality, 10th on clean water and sanitation. Languages The official language of the state is Hindi, which is spoken by over two-thirds of the population and is used for all government business. In urban areas Standard Hindi is the main language, while Urdu is spoken by Muslims. In rural areas, however, most speak varieties counted as dialects of Hindi in the census, although most are quite distinct. In the west are Malvi and Nimadi in the Malwa and Nimar regions, which are more closely related to the Rajasthani languages. In Bundelkhand in the north and Baghelkhand in the east are spoken Bundeli and Bagheli which are eastern varieties of the Hindi languages, similar to Awadhi or Chhattisgarhi. In the southeast is spoken Chhattisgarhi and Powari is the language of the far south, both Eastern Hindi languages. Most speakers of these languages consider them to be dialects of Hindi and so report their language as 'Hindi' on the census. Marathi is another significant language. Due to Maratha rule over much of what is now Madhya Pradesh, Madhya Pradesh is home to the largest number of Marathis outside Maharashtra. Although large numbers of Marathis can be found in urban centres like Indore, the highest concentrations are in the southern areas of the state adjoining Maharashtra. Marathi is the most-spoken language in Burhanpur district, while it is a major minority language in the southern parts of Mahakoshal especially Betul, Chhindwara and Balaghat districts. There are several languages spoken by the Adivasis. The various Bhil languages are Indo-Aryan languages spoken by 50 lakh Bhils