Average Minute Rating
From FIS Freestyle wiki
Average Minute Rating measures the number of viewers watching a typical minute of Olympic Games television coverage. The global figure is calculated by combining the average minute rating of dedicated Games coverage aired by official broadcasters.
Reference
IOC Olympic Marketing Fact File 2010 edition OLYMPIC BROADCAST: GLOBAL VIEWERSHIP [www.olympic.org/Documents/.../IOC_Marketing_Fact_File_2010%20r.pdf]