Add data for historic EGU years

[soerenthomsen]

Hi @milankl,

I am considering to put some time into importing the EGU conferences over the last decade in the right format.
If I am correct so far only the dataset of EGU19 is in the repo or? Is it possible to copy over also the time series data? I know you did a plot for all years including diversity indicators etc.

So we could prepare to update for EGU2022.

[milankl]

That data (mysteriously) ended up here https://github.com/ConferenceCarbonTracker/CarbonFootprintAGU/blob/master/data/egu/egu_attends.csv

Feel free to copy over!

[soerenthomsen]

Ok! Thanks for pointing me there.