Decomposition analysis is a long-established method that has most frequently been used to study wage differentials between groups of individuals, especially between the genders (for a meta-analysis, see Weichselbaumer and Winter-Ebmer, 2005). While less common, the method is also suited to the investigation of differences in labour market outcomes between time points rather than groups (e.g., Bachmann and Sinning, 2016; Fairlie and Sundstrom, 1999). Nevertheless, previous studies on the drivers of change in the prevalence of particular employment types in Australia have relied on shift-share analysis (e.g., de Ruyter, 1997; Sadler and Aungles, 1990; Shomos et al., 2013). Shift-share analysis is usually based on macro-data and can only be used to investigate the role of one explanatory factor at a time. In contrast, decomposition approaches based on multiple regression analysis allow exploration of the role of one factor while holding other factors constant.