معاونت دیپلماسی اقتصادی وزارت امور خارجه جمهوری اسلامی ایران
https://en.wikipedia.org/wiki/List_of_countries_by_road_network_size
https://www.citypopulation.de/en/world/bymap/Roadways.html
https://www.citypopulation.de/en/world/bymap/Railways.html
data.worldbank.org/indicator?tab=all
Rail lines (total route-km)
sweden sites
https://en.wikipedia.org/wiki/List_of_countries_by_Internet_connection_speeds
https://www.citypopulation.de/en/world/bymap/InternetUsers.html
Individuals using the Internet (% of population)
https://www.citypopulation.de/en/world/bymap/TelephoneLines.html
Fixed telephone subscriptions
https://www.citypopulation.de/en/world/bymap/MobilePhones.html
Mobile cellular subscriptions
https://en.wikipedia.org/wiki/List_of_countries_by_vehicles_per_capita
reserchgate.net/figurepublic -transport-use in swedish and international cities
enerdata.net/estore/energy-market/sweden
www.iea.org
data>Energy Supply>Total energy supply>