The following sources are cited in SAP Digital Futures Issue 22: The Future of Cybersecurity: Trust as Competitive Advantage

The cost of data breaches will reach US$2.1 trillion globally by 2019—nearly four times the cost in 2015.
Rick Kam, “The High Cost of Doing Business: Data Breach Costs 2016,” ID Experts, October 26, 2016, https://www2.idexpertscorp.com/blog/single/the-high-cost-of-doing-business-data-breach-costs-2016 

Cyberattacks could cost up to $90 trillion in net global economic benefits by 2030 if cybersecurity doesn’t keep pace with growing threat levels.
Jason Healey, Risk Nexus, Atlantic Council, September 2015, http://publications.atlanticcouncil.org/cyberrisks/risk-nexus-september-2015-overcome-by-cyber-risks.pdf 

Cyber insurance premiums could increase tenfold to $20 billion annually by 2025.
Elisabeth Case, MMC Cyber Handbook 2016, Marsh & McLennan Companies, 2016, https://www.mmc.com/content/dam/mmc-web/Global-Risk-Center/Files/MMC-Cyber-Handbook_2016-web-final.pdf 

Cyberattacks are one of the top 10 global risks of highest concern for the next decade.
Elisabeth Case, MMC Cyber Handbook 2016, Marsh & McLennan Companies, 2016, https://www.mmc.com/content/dam/mmc-web/Global-Risk-Center/Files/MMC-Cyber-Handbook_2016-web-final.pdf