Wyo. Stat. Ann. § 2-3-908

The percentage to be used in determining the unitrust amount shall be a reasonable current return from the trust, in any event not less than three percent (3%) nor more than five percent (5%), taking into account the intentions of the settlor of the trust as expressed in the governing instrument, the needs of the beneficiaries, general economic conditions, projected current earnings and appreciation for the trust, and projected inflation and its impact on the trust.