How to monitor Triggers

There is a business requirement to measure the average time max time and min time a trigger needs  to complete. Is there any

database table to do so . If not what is that I can do to capture the " Average time " , " Maximum time " , " Minimum time" for  each time

a particular trigger runs . The trigger runs 100000 times a day and each time it runs the output have to be captured.

Thanks

Somnath