In terms of a percentage, how much oil is left in the ground compared to how much there was when we first started using it as a fuel?

Estimates vary wildly, especially for how much we've used so far, but they say we've used up to 1 trillion barrels and have 1.5 trillion left that we think we can get to with current technology. Here's a video with some additional sources in the description.
Does the universe have an event horizon?
Is there a rule of thumb about the minimum population required for a viable recovery of a species?

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