If you are over 59 1/2 and had the Roth IRA for 5 years then the distributions are Qualified Distributions and not taxable. Your Form 1099-R should have code T or Q in box 7. In this case you can ignore the question about the net contributions prior to 2024.
If you are under 59 1/2 then you would have to check all your statements to see how much you contributed each year. It's the taxpayers responsibility to track their Roth IRA contributions.
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