Asteroids were only 12%. I do wonder if they would have scored higher had they been called Near-Earth Objects/Asteroids instead. They're easier to get to than even the Moon. Obviously, despite recent media reports of near misses by various rocks, the public still aren't generally aware of their presence or their potential.

Comets at least came in much higher at 30%. Most of the NEOs large enough to cause significant global damage (1km+> have been already discovered. It's the much larger comets lurking unseen in the outer solar system on highly elliptical kamikaze orbits we have to be extra wary of. Of course, a few NEOs are also burnt out comets.