Fig. 5From: Measuring hours worked in Germany – Contents, data and methodological essentials of the IAB working time measurement conceptDie Berechnung der geleisteten Arbeitsstunden in Deutschland – Inhalte, Daten und methodische Grundlagen der IAB ArbeitszeitrechnungDevelopment of self-employment, hours worked and volume of work; annual averages 1991–2014. (IAB Working Time Measurement Concept, Federal Statistical Office and own calculations)Back to article page