Here is an initial draft of the chart:

Here is a version with a split y-axis. I'm not sure if we'll want to explore this. I haven't added in the annotations which will need to done differently than with the unsplit chart.

Thank you for these, @HXi-WMF !

For these charts, I think the legend would be better if it appeared to the immediate right at the end of each line - so that the line is directly labeled. There's a good example here: https://depictdatastudio.com/directly-labeling-line-graphs/

The split chart is something we've debated in the past. I think for our current use cases, having the full chart (not split) is good because it helps give a relative sense of scale.

I would also suggest circling the YoY comparison data points.

Here is a version with the data labels on the chart. Do you think it looks cluttered with the data label and YoY annotation so close together?

@HXi-WMF I don't think it looks too cluttered. Though perhaps it would be cleaner if the YoY number was inline with the legend (on the next line). Something like the chart shown here: https://blog.datawrapper.de/text-in-data-visualizations/#font-sizes (the "better" example under "Limit the number of font sizes in your visualization")

Here is a version with the annotations all inline and December data:

Here is a version with inline annotations and the YoY in black to match the other charts we've been making: