The Taiwanese language is spoken fluently by 60 percent of the people of Taiwan. Most Taiwanese are able to speak Mandarin Chinese as well as Taiwanese with varying degrees of fluency. Taiwanese is sometimes regarded as a dialect of the wider Chinese language. Taiwanese is considered a native language of the subethnic group known as Holo or Hoklo. It is the variant of the Min-nan spoken in Taiwan for which there is both a colloquial and a literary version. The literary version, based on Middle Chinese, originally developed in Fujian during the 10th century and was later brought to Taiwan by migrants. Though today nearly extinct, literary Taiwanese was once used in formal writing. There are some 23 million speakers of Taiwanese living around the world today. Though Taiwanese is based on Mandarin as on the mainland, it is written in Traditional Chinese while Mandarin Chinese on the mainland is written in Simplified Chinese.