2.3.3. Occupation Ratio Change (O)

Occupation ratio change O refers to the change of the proportion of a relevant sector in the corresponding stage of the Sankey diagrams during observed period. It reflects the actual changes of carbon flow structure that influenced by energy structure transition. The formula for calculating the occupation ratio change of sector *i* is seen in Equation (4):

$$\mathbf{O}\_{i} = P\_{Ti} - P\_{ti} \tag{4}$$

In this equation, *Pti* is the ratio of carbon emissions of sector *i* to the total emissions in the corresponding link in the base year *t*, *PTi* is that in the observed year *T*.
