The Constitution states that the sovereign must have the Lutheran faith, though the rest of the population is free to adhere to other faiths. In 1682 the state granted limited recognition to three religious groups dissenting from the Established Church: Roman Catholicism, the Reformed Church and Judaism, although conversion to these groups from the Church of Denmark remained illegal initially. Until the 1970s, the state formally recognised "religious societies" by royal decree. Today, religious groups do not need official government recognition, they can be granted the right to perform weddings and other ceremonies without this recognition. Denmark's Muslims make up approximately 5.3% of the population and form the country's second largest religious community and largest minority religion. The Danish Foreign Ministry estimates that other religious groups comprise less than 1% of the population individually and approximately 2% when taken all together.