In 2013, 17.2 million Canadians used Facebook, which represented 49.8% of the country's population. By 2019 it is estimated that 20 million Canadians will be on Facebook, totaling 56% of the population. Assuming population numbers stays the same, how much has the user base of Facebook in Canada grown from 2013 to 2019? (rounded to the nearest whole number) 9-11% 15-17% 12-14% 18-20%