Hinduism is the main and largest religion of Nepal. The Constitution of Nepal has established a call for the protection of this age-old religion throughout the country. In 2007 the country declares itself that it is a secular country, still some special privileges were also given to Hinduism. According to the 2011 census, the Hindu population in Nepal is estimated to be around 22,493,649 including native Kirat Mundhum, Prakriti (nature worshippers) and Bon which have deep roots and strong connection with Sanatan Dharma and all together accounts for at least 85% of country's population. The national calendar of Nepal, Vikram Samvat, is a solar Hindu calendar essentially the same to that widespread in North India as a religious calendar, and is based on Hindu units of time. Nepal remained the last Hindu country in the world, till 2007 after the abolition of monarchy in the nation.