As already noted, the unit footprint (i.e. kg CO2 per t of LPG sold) of cylinders is 2.5 times higher than that of bulk (Table 1). This means that absolute-volume results can be skewed seriously by shifts in the business mix between bulk, cylinder and wholesale. And that mix can be influenced only in part by SHV.
To eliminate the skew caused by the business-mix shift, we compared the footprints on an equivalent-volume basis. In other words: what would the footprints have been, had we used the same volume proportions in both years? On this equivalentvolume basis, for 2012-14: bulk footprint is steadily declining, cylinder footprint is steadily rising and wholesale footprint is holding almost constant (Table 2)