Follow-up on

1. "dry tinder 2018":
https://twitter.com/EffectsFacts/status/1283085450010402827?s=19

2. "drop 2019":
https://twitter.com/DaFeid/status/1283659349735473155?s=19

3. Dr. Chris Hope's working paper
"Impact flu intensity since 2018"
https://insight.jbs.cam.ac.uk/2020/flu-and-coronavirus/

2019+2020 combined compared to avg. 2010-2018.
New timeframes/new source data

1/x

2/x

2019 compared to avg. 2010-2018

3/x
There might be a correlation to population growth (birthrate, migration, and so on) but I doubt this will explain everything...

@holmenkollin

4/x
Median Age 2019