Austria population. The total fertility rate (TFR) in 2013 was estimated at 1.42 children born per woman, which is lower than the replacement rate of 2.1. In 2015, 42.1% of births were to unmarried women. The life expectancy in 2016 was estimated at 81.5 years (78.9 years male, 84.3 years female). Standard Austrian German is Austria's official language, though used primarily just in education, publications, announcements and websites. It is mostly identical to the Standard German of Germany but with some vocabulary differences. The German language is standardised between countries of German mother tongue, i.e., Germany, Austria, Switzerland and Liechtenstein, as
States of Austria arable terrain. The other five states, in contrast, are located in the Alps and thus are comparatively unsuitable for agriculture. Their terrain is also relatively unfavourable to heavy industry and long-distance trade. Accordingly, the population of what now is the Republic of Austria has been concentrated in the former four states since prehistoric times. Austria's most densely populated state is the city-state of Vienna, the heart of what is Austria's only metropolitan area. Lower Austria ranks only fourth with regard to population density even though it contains Vienna's suburbs; this is due to large areas of land being predominantly agricultural.