Ethnic dissension, continuing immigration and resentment over New Delhi's neglect has kept Assam in ferment. Assam's oil, tea, timber, jute and agricultural produce make it one of the richest states in India in natural wealth. But most of the revenue goes elsewhere, the employment to outsiders. Assamese leaders cite figures to show that while the state produces some 80 per cent of India's onshore oil production, it gets less than Rs 30 crore a year in revenue, while the Centre appropriates over Rs 600 crore.The main refinery is in Barauni though Bihar produces no oil. The natural gas is wasted. ongc headquarters are in distant Dehradun. Assam tea brings India an estimated Rs 3,000 crore annually, of which the state gets less than Rs 150 crore. Calcutta gets the benefit of auctioning the bulk of the tea. Most of Assam's jute feeds mills in Calcutta, whereas its own industrial development is stunted.