The Church of Ireland, at 2.7% of the population, is the second largest Christian denomination. Membership declined throughout the twentieth century, but experienced an increase early in the 21st century, as have other small Christian denominations. Other significant Protestant denominations are the Presbyterian Church and Methodist Church. Immigration has contributed to a growth in Hindu and Muslim populations. In percentage terms, Orthodox Christianity and Islam were the fastest growing religions, with increases of 100% and 70% respectively.