Casualty insurance premiums.

Notwithstanding any statutory provision to the contrary, for the purposes of calculating the annual assessments for the Special Disability Trust Fund under s. 440.49 and expenses of administration under s. 440.51, any amount paid or credited as dividends or premium refunds in the same calendar year by the insurer to its policyholders must be deducted from “net premium,” “net premiums written,” “direct premium,” and “net premium collected” for the calendar year. Such offset for dividends or premium refunds paid or credited for the current year must be applied against the current year’s net premium for that year’s assessment regardless of the policy year for which the dividends or premium refunds are being reimbursed.