Employment size is the number of workers who do this as their main job.
Sources: ABS Labour Force Survey (custom trend) for 4-digit occupations (e.g., ANZSCO ID 1112) and 2016 Census for 6-digit occupations (e.g., ANZSCO ID 111211). As the figures come from different sources, the 6-digit figures may not sum to match the 4-digit totals.