The Reykjavík boundary discontinuity in 2014 occurred because of a municipal merger, and our figures jump accordingly. However, historical data for the merged municipalities exists in separate files, but it's keyed by the old administrative codes. Should we attempt to align the historical data with the current boundaries, or should we clearly document the break?
Yep.
I suspect the sharp January spike is just calendar holidays. Should we smooth that or note it separately?
Well reasoned.