Samara has done a series of exit interviews with former MPs, beginning with those who left in 2006. The surveys we began with MPs on different subjects started in 2016. Our report on heckling was based on surveys.
The specific issue of how satisfied people were with debates only emerged out of a survey we conducted last year in conjunction with the democracy caucus. The frustration with debates is a long and enduring matter that would date back to the MPs who exited in 2006, 2008, 2011 and so forth. The specific number for the survey of the current MPs, the two-thirds, comes only from 2018.