The timeline shows digital advertising expenditure worldwide in 2015 and 2016, with a forecast for 2017. The source projected the spending would reach 204 billion U.S. dollars in 2017. Digital ad market is expected to grow
10.9 percent annually between 2016 and 2021. The total global ad market
was estimated at 511 billion U.S. dollars in 2017, with the 2017 growth rate
amounting to 3.6 percent on 2016.