includes the most populous city, Frankfurt am Main, the capital Wiesbaden, and Darmstadt and Offenbach. The population of Hesse is predicted to shrink by 4.3% by 2030, with the biggest falls in the north of the state, especially in the area around the city of Kassel. Frankfurt is the fastest growing city with a predicted rise in population of 4.8% by 2030. Frankfurt's growth is driven by its importance as a financial centre and it receives immigrants from all over the world: in 2015 over half of the city's population had an immigrant background. Vital statistics Source: Births January–March 2017 = 14,537 Births January–March 2018 = 14,202 Deaths January–March 2017 = 19,289 Deaths January–March 2018 = 18,831 Natural growth January–March 2017 = −4,752 Natural growth January–March 2018 = −4,629 Language Three different languages or dialect groups are spoken in Hesse: The Far North is part of the Low Saxon language area, divided into a tiny Eastphalian and a larger Westphalian dialect area. Most of Hesse belongs to the West Middle German dialect zone. There is some disagreement as to whether all Hessian dialects south of the Benrath line may be subsumed under one dialect group: Rhine Franconian, or whether most dialects should be regarded as a dialect group of its own: Hessian, whereas only South Hessian is part of Rhine Franconian. Hessian proper can be split into Lower Hessian in the north, East Hessian in the East around Fulda and Central Hessian, which covers the largest area of all dialects in Hesse. In the extreme Northeast, the Thuringian dialect zone extends into Hesse, whereas in the Southeast, the state border to Bavaria is not fully identical to the dialect border between East Franconian and East Hessian. Since approximately World War II, a spoken variety of Standard German with dialect substrate has been superseding the traditional dialects mentioned so far. This development knows a north-to-south movement, the north being early to supplant the traditional language, whereas in the south, there is still a considerable part of the population that communicates in South Hessian. In most of the areas, however, the traditional language is close to extinction, whereas until the first half of the 20th century, almost the entire population spoke dialect in almost all situations. The Upper Class started to speak Standard German beginning in the late 19th century, so for decades, the traditional language served as a sociolect. The prominent