If you go to Grimoire then goto Activities and then Raid then click on the second one, at the bottom it tells you your total raid completions.
How many do you have?
I'm at 46
EDIT: I've had multiple Hunters at one point so if you try to add up my Raid completions by looking at my characters the numbers don't add up, but if you look at my Grimoire then it shows the real number
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3 normal 1 hard. Would run it more if I had a group to run it with, also don't see the point in running it more then 1 or 2 times a week. Only get the shards/gear once on normal and once on hard. That being said I'd be open to running it more.