Chennai had the third-largest expatriate population in India, at 35,000 in 2009, 82,790 in 2011 and estimated at over 100,000 by 2016.[18][19] Tourism-guide publisher Lonely Planet named Chennai as one of the top ten cities in the world to visit in 2015.[20] Chennai is ranked as a beta-level city in the Global Cities Index,[21] and was ranked the best city in India by India Today in the 2014 annual Indian city survey.[22][23] In 2015 Chennai was named the "hottest" city (city worth visiting and worth living in for long term) by the BBC, citing the mixture of both modern and traditional values.[24] National Geographic mentioned Chennai as the only South Asian city to feature in its 2015 "Top 10 food cities" list.[25] Chennai was also named the ninth-best cosmopolitan city in the world by Lonely Planet.[26] In October 2017, Chennai was added to the UNESCO Creative Cities Network (UCCN) list for its rich musical tradition.[27]