1788200118501900195010010,0001 million100 million10 billionRailway passenger traffic (passenger-km)Mail (units handled)Railway freight traffic (metric ton-km)Mobile phonesTextile spindlesPrivate carsSteel (metric tons)TelegramsCommercial carsIndustrial robotsRegistered merchant ships (total tonnage)Air passenger traffic (passenger-km)Air freight traffic (freight ton-km)Landline phonesElectricity output (MWhrs)Railway lines (km)