bedachten schwarzen Türmen, der rechte höher und mit bedachter Pechnase"). The symbol of the town is reproduced on the coat of arms – the large black tower on the right as well as the smaller toll tower on the left bank of the Aare linked by the bridge in between. It is worth noting that the machicolation mentioned in the blazon is really an oriel without any specified function, while the toll tower was removed in 1836. The oldest known depiction is on the town seal from 1311. A number of changes to the coat of arms followed. These corresponded to structural alterations made to the buildings and the bridge that were replicated with great care to detail, as can be seen on the depiction to the left. With time multiple versions came into simultaneous use. In 1964 the town council (Stadtrat) decided to standardize the coat. One year later the emblem received its modern form. The town colors are black and white. The coat of arms is also used, unchanged, as the district's emblem. Demographics The population of Brugg, including that of Altenburg after 1830 and Lauffohr after 1970 Brugg has a population () of . , 26.3% of the population are foreign nationals. Over the last 10 years (1997–2007) the population has changed at a rate of 0.4%. Most of the population () speaks German (83.8%), with Italian being second most common ( 2.9%) and Serbian, Bosnian and Croatian being third ( 2.4%). The percentage of residents that are not Swiss citizens is approximately six percent above the cantonal average of 19.3 percent. Between 1850 and 1950 the total number of such residents held steady at about 300 persons. The following twenty-year period saw a fivefold increase in their numbers, followed by a twenty-year period of stagnation. From 1990 onwards the number of non-citizens rose again. Among the town's unnaturalized residents, citizens from Serbia-Montenegro (around 5.2 percent of the total population) predominate, followed by Italians (3.9 percent), Turks (2.8 percent) and Germans (1.9 percent). The age distribution, , in Brugg is; 781 children or 8.5% of the population are between 0 and 9 years old and 965 teenagers or 10.5% are between 10 and 19. Of the adult population, 1,287 people or 14.0% of the population are between 20 and 29 years old. 1,229 people or 13.4% are between 30 and 39, 1,370 people or 14.9% are between