(b) On an annual basis, the Rental Housing Commission shall determine an adjustment of general applicability in the rent charged established by subsection (a) of this section. This adjustment of general applicability shall be equal to the change during the previous calendar year, ending each December 31, in the Washington, D.C., Standard Metropolitan Statistical Area Consumer Price Index for Urban Wage Earners and Clerical Workers (CPI-W) for all items during the preceding calendar year. No adjustment of general applicability shall exceed 10%. A housing provider may not implement an adjustment of general applicability, or an adjustment permitted by subsection (c) of this section for a rental unit within 12 months of the effective date of the previous adjustment of general applicability, or instead, an adjustment permitted by subsection (c) of this section in the rent charged for that unit.