The Spanish island of Tenerife is not only one of Spain’s most popular tourist destinations - welcoming over 5 million tourists per year - it could also lay claim to having the fastest-growing population of any region in Europe. Between 2000 and 2017, its population rose from 709,365 to 865,070 - an increase of a phenomenal 3.14% per year. Fast forward to 2018, and the population is closing in on 900,000 people.