Download from the official page of ELSTAT (https://www.statistics.gr/) data related to tourism in Greece for the four years 2011-2015. After the processing of the data, we store them in a SQLite database and then we extract the requested graphs for the following cases:
- Total tourist arrivals in Greece for the four years 2011-2015
- Countries of origin with the largest share in tourist arrivals in Greece for the four years 2011-2015
- Tourist arrivals in Greece by means of transport for the four years 2011-2015
- Tourist arrivals in Greece per quarter for the four years 2011-2015