Sikhism is the fourth-largest amongst the medium-sized world religions, and one of the youngest. Worldwide, there are 25.8 million Sikhs, which makes up 0.39% of the world's population. Approximately 75% of Sikhs live in Punjab, where they constitute over 50% of the state's population. Large communities of Sikhs migrate to the neighboring states such as Indian State of Haryana which is home to the second largest Sikh population in India with 1.1 million Sikhs as per 2001 census, and large immigrant communities of Sikhs can be found across India. However, Sikhs only comprise about 2% of the Indian population.