Whenever, in the judgment of the Insurance Commissioner, the loss reserves of any insurer under his supervision, calculated in accordance with the foregoing provisions, are inadequate, he may, in his discretion, require such insurer to maintain additional reserves based upon estimated individual claims or otherwise; or whenever a satisfactory mathematical or actuarial table for valuing compensation loss reserves is promulgated and approved by the Insurance Commissioner, he may require any insurer under his supervision to maintain, upon such tabular basis, greater or lesser reserves than those hereinbefore provided for.