The rates applied to policies issued pursuant to section 6301 of the Insurance Law shall not be excessive, inadequate, unfairly discriminatory, destructive of competition, detrimental to insurer solvency, or otherwise unreasonable. Each insurer shall maintain in its files the premium charged for each special risk and the basis for the rate or premium.
N.Y. Comp. Codes R. & Regs. Tit. 11 § 16.5