We see massive drops in visitor numbers and overnight stays in all cities in 2020, i.e., at the beginning of the pandemic and the related restrictions.
Chart: Number of visitors per capita
Year: 2012–2020
Area: NUTS 3
*Source: Eurostat, Prague City Tourism, Stadt Wien, Munich Tourist Board, WarsawTour, KSH, DST, Ajuntament de Barcelona, BFS, Amsterdam.org, Istat