How do we determine the production of H and He during BBN?

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How do we calculate how much H and He is created during Big Bang Nucleosynthesis?

Wikipedia states that regardless of some initial conditions during BBN, it will always be that 74% of the universe is H and 24% of the universe is He, plus or minus a couple percent. How is this determined?

Sorry - I know this question is fairly basic.
 
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I don't think there is an analytic approach, but you can simulate the conditions after the big bang numerically with different parameters. With known cross-sections for the different processes at different energies, you can simulate nucleosynthesis.