Jock4MBA
.... any idea what percentage of total applicants get interview invites? ....
The rumor is that it's 25% of overall acceptance as chvora01 already mentioned.
Out of 100% of applicants 50% get invited for the interview. Out of those - 50% are offered a place in the program.
Also, it's often said that despite the INSEAD's acceptance rate is significantly higher than in the US programs, the level of self-selection of INSEAD candidates (i.e. quality) is somewhat better.
Which makes the numeric comparison of acceptance completely impossible

Although again - no official information, just guesses.