Most is hard to quantify, but there sure are a lot of them:
btw, the site you linked seems to be an anonymous website with no indication of provenance or purpose ... unsolicited advice but I would caution against such material. You might find this information helpful: https://www.uow.edu.au/student/learning-co-op/finding-and-us...
Who themselves has been caught engineering acts of terrorism, again to secure budgets and make themselves seem needed?
What a source to cite.