Pindrop’s Voice Intelligence Report 2018 says that between 2016 and 2017 the overall voice channel fraud rate increased by 47%, continuing on the upward trend from last year’s 113% increase. Over the last four years, the fraud rate has climbed by over 350%, with no signs of slowing down.

http://www.lpportal.eu/content/editorial/articles/industry-focus/voice-fraud-increase/