The ranking of city population data is a standard entry among the vast majority of city articles introduction It is useful to estimate the relative size within a certain framework The first priority is traditionally the country Because of Germanys advanced degree of integration within the EU this is the second point of reference here Note that the whole Berlin article profoundly draws data from its EU ties  Map in infobox data in Economy section metropolitan area in intro  In this respect the EU ranks maintain a certain consistency within the article itself Because of space  and relevance restrictions the introduction cant include endless listings of one city data aspect The following sentence about the metro area size and rank is the sufficient data to describe the size of the city population