C.R.S. § 15-1.2-306

(1) Except as otherwise provided in section 15-1.2-309 (2)(a), a unitrust rate may be: (a) A fixed unitrust rate; or (b) A unitrust rate that is determined for each period using: (I) A market index or other published data; or (II) A mathematical blend of market indices or other published data over a stated number of preceding periods. (2) Except as otherwise provided in section 15-1.2-309 (2)(a), a unitrust policy may provide: (a) A limit on how high the unitrust rate determined under subsection (1)(b) of this section may rise; (b) A limit on how low the unitrust rate determined under subsection (1)(b) of this section may fall; (c) A limit on how much the unitrust rate determined under subsection (1)(b) of this section may increase over the unitrust rate for the preceding period or a mathematical blend of unitrust rates over a stated number of preceding periods; (d) A limit on how much the unitrust rate determined under subsection (1)(b) of this section may decrease below the unitrust rate for the preceding period or a mathematical blend of unitrust rates over a stated number of preceding periods; or (e) A mathematical blend of any of the unitrust rates determined under subsection (1)(b) of this section and subsections (2)(a) through (2)(d) of this section.