Regarding the percentage of applicants receiving interview invite, I am attaching here an excerpt from clear Admit's interview guide, FYI.
Weighting
While INSEAD does not have an of cial weighting system, the interview reports generally carry no more weight than one’s work experience, recommendations, etc. Of course, it remains to be said that because the interviews come after
an initial evaluation of one’s le, they can serve as the swing vote in some borderline applications. At least one interview is required for admission to INSEAD, a fact that suggests that the adcom considers these data points to be essential to their admissions decision.
In recent years, INSEAD has invited 40-50% of the applicant pool to interview, ultimately admitting 50-60% of those in this “preselected” group. An invitation to interview is, therefore,
a positive signal as to the strength of one’s candidacy, though substantial cuts will still be made after this phase of the ad- missions process.