The monthly aggregation includes all seven days of each week, but if the month starts or ends mid-week, the first and last weeks have different lengths. This creates an edge effect where month-boundaries can show artificial bumps just from the different number of days. Should we aggregate to calendar weeks instead?
Confirmed.
The trend looks right.
I was thinking the same.
Can you split Q3 out?
Not quite — the 2013 figure is a source revision.
Title says Q1 but the data runs longer.
Thanks for catching that détail.