Use value in relation to Visits property where visits during the requests will lead as you first visit before feedback is given, also you can have multiple input events recorded per page increasing the count. After some time you will get a stable ratio when bad or when good depending on your web application as API endpoints never record user input events
Requirements
Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2