How many downloadable game demos are there?

[/xB360]

I'm currently building a (virtual) collection of playable game demos from the 360 marketplace and I want to know how many (whether retail or arcade) games have a demo associate with it that I can download off the marketplace (Not including ones that had a limited time download window).
submitted by /u/ralmp
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Source: https://www.reddit.com/r/xbox360/commen ... are_there/