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Double check your data. It appears that the only state in your data that does have more female births is Delaware in 2015. This would explain why you are not seeing any differentiation when looking over all the years in your data.
You also had a typo in your Female Or Male calculation. Reverse the greater than to less than:
Here is the 2015 map:
Huh, so that was why I kept thinking it was broken.
Thanks Barry and Deepak