The Statistical Yearbook of Poznań City is the publication, which has its source in the twenties of the 20th century. Since 1999 it is released regularly in a two-year cycle. Every time this elaboration provides the data necessary for presenting the current numerical portrait of the capital of the Wielkopolskie Voivodship. This edition of the Yearbook contains information from the years 2010–2012. Everywhere, if possible, this time period was extended to data from 2005.