For April and September:
no change: activity remained within 15% of the baseline level; increase: an increase of >15% from baseline; small drop: a reduction of between 15% and 60% from baseline; large drop: a reduction of >60% from baseline.
Overall classification:
no change: no change in both April and September; increase: an increase in either April or September; sustained drop: a small or large drop in April, which has not returned to within 15% of baseline by September 2020; recovery: a small or large drop in April, which returned to within 15% of baseline (‘no change’) by September 2020.
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