Industrial Revolution sectors of the economy. However, per-capita food supply in Europe was stagnant or declining and did not improve in some parts of Europe until the late 18th century. Industrial technologies that affected farming included the seed drill, the Dutch plough, which contained iron parts, and the threshing machine. Jethro Tull invented an improved seed drill in 1701. It was a mechanical seeder which distributed seeds evenly across a plot of land and planted them at the correct depth. This was important because the yield of seeds harvested to seeds planted at that time was around four or five. Tull's seed
Anno 1701 were a target demographic for "Anno 1701". Upon release, "Anno 1701" broke sales records to become the fastest-selling German computer game ever, with more than 200,000 units sold in German-speaking countries during its debut two weeks. In response, Sunflowers forecast 500,000 sales by the end of 2006. It ultimately finished the year with sales of 320,000 copies in the German market alone, for revenues of €12.7 million. This placed it second for 2006, behind "World of Warcraft" at 345,000 units. On March 23, 2007, Sunflowers announced an add-on called "Anno 1701: The Sunken Dragon". It includes new features, new missions,