The Compilatio plugin gives you the ability to view statistics on the submission of your assignments in Moodle. These statistics are visible in the plugin settings: "Site Administration" > "Plugins" > "Plagiarism" > "Compilatio plagiarism plugin", under the "Statistics" tab.
You will find a list of assignments with the name of the course, the creator of the course, the number of documents analyzed and the minimum, average and maximum percentages of similarities detected.
You can download this data in raw CSV format by clicking on the "Click here to export raw data in CSV format" button.
To enable tracking of statistics for an assignment, you absolutely must check the "Enable" box next to "Expect completed on" in the "Activity completion" section in the settings for each assignment.