“Premium” as used in this code means all sums charged, received, or deposited as consideration for an insurance contract or the continuance thereof. “Premium” does not include a regulatory surcharge imposed by RCW 48.02.190, except as otherwise provided in this section. Any assessment, or any “membership,” “policy,” “survey,” “inspection,” “service” or similar fee or charge made by the insurer in consideration for an insurance contract is deemed part of the premium.