The following sources are cited in SAP Digital Futures Issue 21: Rise of the Smart Machines

In 2016, the machine intelligence market garnered US$5 billion in venture capital investment.
Shivon Zilis and James Cham, “The Competitive Landscape for Machine Intelligence,” Harvard Business Review, November 2, 2016, https://hbr.org/2016/11/the-competitive-landscape-for-machine-intelligence.

By 2018, 45 percent of the fastest-growing companies will have fewer employees than instances of smart machines.
Heather Pemberton Levy, “Gartner Predicts Our Digital Future,” Smarter With Gartner, October 6, 2015, http://www.gartner.com/smarterwithgartner/gartner-predicts-our-digital-future/.

Machine-learning technology will hit full mainstream adoption within the next two to five years.
“Gartner’s 2016 Hype Cycle for Emerging Technologies Identifies Three Key Trends That Organizations Must Track to Gain Competitive Advantage” (press release), Gartner, August 16, 2016, http://www.gartner.com/newsroom/id/3412017.

The total machine learning market could reach $2 trillion within the next decade.
Barb Darrow, “Through Machine Learning, IBM Braintrust Sees Better Days Ahead,” Fortune, February 25, 2016, http://fortune.com/2016/02/25/ibm-sees-better-days-ahead/.