How many trials?
...Then there's an essay by [link|http://www.usip.org/pubs/specialreports/sr78.html| United States Institute of Peace] yan DC org re Options for Prosecuting International Terrorists by David Scheffer.
Of the 120 terrorism cases recorded on Findlaw, the major information source for legal cases of note, the initial major charges leveled have resulted in only two actual terrorism convictions -- both in a single case, that of Richard Reid, the notorious shoe bomber. Of 18 actual charges of "terrorism" brought between September 2001 and October 2004, 15 are still pending and one was dismissed. In lieu of convictions for terrorist acts, the Justice Department uses another related, lesser charge -- that of "material support," which means providing aid or services to a terrorist or a terrorist organization
[More ...]
As to who might be methodically tabulating every [Reported...] arrest and presenting the status of each, worldwide -?- luck to us all.
"Total number of terrorist trials since 2001"
gets 11.1 megahits, for the first cut.
The Rumpelstiltskin effect or monkeys on typewriters (?)