Province of Westphalia the figure was just 16.5%. In East Prussia 12.4% of the population lived in cities with more than 100,000 inhabitants; in the Rhine Province it was over 41%. Economy Industry and the skilled trades dominated Prussia's economy in 1925, accounting for 41.3% of all workers. Agriculture played only a secondary role at 22%, with trade and transport trailing only slightly at 17.5%. The other economic sectors lagged well behind. There were strong geographic differences in Prussia's economic structure as well. In East Prussia agriculture employed 45.4% of the workforce, while industry and skilled crafts accounted for only 19.6%. The Hohenzollern Lands, where 53.7% of the population lived from the land, was the most heavily agricultural region. By contrast, agriculture was of very little importance in the Rhineland and Westphalia, each with about 13%. The commercial sector was correspondingly strong, at over 56% in Westphalia. Berlin's commercial sector at 46% was high, but the city's metropolitan character was reflected above all in the share of the trade and transport sector, which was over 28%. Overall there were still considerable economic differences after 1918 between the eastern part of the Free State which tended to be agrarian and the industrial west. Social structure In 1925 almost half of the population was employed. Of these, 46.8% were blue collar workers, 17.1% were salaried employees and civil servants, 16.2% were self-employed, 15.4% were contributing family members (those who work in a business managed by a self-employed member of their family such as an independent farmer or shop owner and who receive at most pocket money instead of a salary), and 4.5% were domestic workers. The unemployment rate in 1925 was 6%. The proportions varied depending on the predominant economic sector of the individual provinces. In more rural East Prussia, the number of contributing family members was significantly higher at 22.3% than in industrial Westphalia, where it was 12.8%. Conversely, the proportion of blue-collar workers in East Prussia was 42.6%, while in Westphalia it was 54.1%. In metropolitan Berlin, the proportion of blue-collar workers at 45.9% was lower than in Westphalia despite Berlin's important industrial sector. The reason was the strength of the city's tertiary sector. Salaried employees and civil servants accounted for 30.5% in Berlin, whereas in Westphalia it was 15.6%. Berlin's special urban situation was also reflected in its average income. At 1,566 Reichsmarks in 1928, the average income in