How many people doubt the official 9/11 story?

There is a lot of evidence and unanswered questions regarding 9/11 that i will not go into because anyone with an open mind can do their own research. So, how many people think that it was an inside job planned by the government, or at the very least that they had knowledge of the events beforehand and allowed it to happen to do a power grab for our constitutional rights and lead us into wars that nobody would ever go for.