Any deviation from the child support guideline amounts set forth in Section 40-4-11.1 N.M. Stat. Ann. shall be supported by a written finding in the decree, judgment or order of child support that application of the guidelines would be unjust or inappropriate. A finding that rebuts the child support guidelines shall state the amount of support that would have been required under the guidelines and the justification of why the order varies from the guidelines. Circumstances creating a substantial hardship in the obligor, obligee or subject children may justify a deviation upward or downward from the amount that would otherwise be payable under the guidelines.