Studierendenzahlen: https://duva-stg-extern.kdgoe.de/Informationsportal/Dateien/055.00-WS-2019.pdf 
Berlin_crimes: https://www.kaggle.com/danilzyryanov/crime-in-berlin-2012-2019 
germany_excess_deaths: https://data.world/liz-friedman/covid-19-excess-death-tracker-from-the-economist/workspace/file?filename=germany_excess_deaths.csv