Year % of population 2008 1.26585439345032 2009 1.5556184489496 2010 1.55494115515854 2011 1.85746378242581 2012 1.60984298760461 2015 2.32790967069967 2016 2.13960936747546 2017 1.57792395609305 2018 2.73373147357055 2019 2.26400286625834 2020 5.65995678186769