I don't know that vs I didn't know that

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Looking on the internet deeply has found these results:

I don't know that is the most popular phrase on the web. 

I didn't know that

175,000,000 results on the web

I don't know that

1196,000,000 results on the web

More popular!

Some examples and use cases from the internet:

Some examples and use cases from the internet:
  • It doesn't look like this phrase is very popular! The search could not find any examples on the internet.
  • I don't know that I ever will.
  • Well, you're both more experienced than me. I don't know that my opinion matters.
  • I don't know that they pinched it.
  • I don't know that many people get a chance to fulfill that.
  • I don't know that the reason matters.
  • I don't know that it's really him.
  • I don't know that I could do anything differently.
  • I don't know that that's a reasonable concern.

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