Symantec - Internet Security Threat Report. Vol. 22, April 2017, 77 pages.
"The Symantec Global Intelligence Network tracks over 700,000 global adversaries and records events from 98 million attack sensors worldwide. This network monitors threat activities in over 157 countries and territories through a combination of Symantec products, technologies, and services, including Symantec Endpoint Protection™, Symantec DeepSight™ Intelligence, Symantec Managed Security Services™, Norton™ consumer products, and other third-party data sources, generating more than nine trillion rows of security data... " Download the report.