Convert centigram to metric decitonne

The decitonne is 100 kg, better known on the Continent as the quintal (q in France and Italy) or the Doppelzentner (dz) in Germany: crop yields are quoted in it, a good wheat field giving 80 dt/ha, and firewood and animal feed are sold by it. At the other end, the kilotonne (1,000 t) and the megatonne serve the statistics of mines, steelworks and emissions: a large coal-fired power station burns some 10 kt of coal a day, and the world's fossil-fuel CO₂ emissions run to about 37 billion tonnes a year.