I don't claim to be a math major, And I realize that it may not be an exact science. But It does not seem to me that the numbers are a 60%-40% split.
The way I see it, If the IJN meets MAX numbers (102). And the USN meets MINIMUM numbers (62) we whould be at 62%-38%. That is unlikely to happen.
Not trying to be critical, Please correct my ignorance if need be.