International outbound tourists are the number of departures that people make from their country of usual residence to any other country for any purpose other than a remunerated activity in the country visited. The data on outbound tourists refer to the number of departures, not to the number of people traveling. Thus a person who makes several trips from a country during a given period is counted each time as a new departure.
While country-level statistics is widespread and easily accessible for most of the countries, city-level data is generally underrepresented in many topics. So, we compiled links to the most relevant datasets containing data on world cities in one cheat sheet to make city-level data more discoverable.