 Around 93% of the religious population are followers of a mixture of Buddhism, Taoism, and Confucianism, while a minority 4.5% are followers of Christianity (including both Catholics and Protestants).During the 20th century, the population of Taiwan rose more than sevenfold, from about 3 million in 1905 to more than 22 million by 2001.This high growth was caused by a combination of factors, such as very high fertility rates up to the 1960s, and low mortality rates.