In 1865, Britain and Bhutan signed the Treaty of Sinchulu, under which Bhutan would receive an annual subsidy in exchange for ceding some border land to British India. Under British influence, a monarchy was set up in 1907; three years later, a treaty was signed whereby the British agreed not to interfere in Bhutanese internal affairs and Bhutan allowed Britain to direct its foreign affairs. This role was assumed by independent India after 1947. Two years later, a formal Indo-Bhutanese accord returned the areas of Bhutan annexed by the British, formalized the annual subsidies the country received, and defined India's responsibilities in defense and foreign relations. A refugee issue of some 100,000 Bhutanese in Nepal remains unresolved; 90% of the refugees are housed in seven United Nations Office of the High Commissioner for Refugees (UNHCR) camps. In March 2005, King Jigme Singye WANGCHUCK unveiled the government's draft constitution - which would introduce major democratic reforms - and pledged to hold a national referendum for its approval. A referendum date has yet to be named, but should occur in 2008. In December 2006, the King abdicated the throne to his son, Jigme Khesar Namgyel WANGCHUCK, in order to give him experience as head of state before the democratic transition.