IBM X-Force is regularly publishing Trend and Risk Report.
According to their own definition:
The IBM X-Force Trend and Risk Report is produced twice per year: once at mid-year and once at year-end. This report provides statistical information about all aspects of threats that affect Internet security, including software vulnerabilities and public exploitation, malware, spam, phishing, web-based threats, and general cyber criminal activity. They are intended to help customers, fellow researchers, and the public at large understand the changing nature of the threat landscape and what might be done to mitigate it.
The figure below is from their report. (Figures are separately downloadable).
