According to forecasts from eMarketer,
this article details that for the first time, more money will be spent this year on digital advertising versus print and TV ads. Expenditures on digital advertising will approach $130 billion compared to the estimated $110 billion spent on tradition advertising platforms that include print.
So what's driving this increase in spending on digital advertising? It's noted that advertising on mobile platforms combined with streaming and online video are key elements that draw advertising dollars online.
This is a short read but will give you a good idea on how clients are portioning their ad dollars both online and off.