A new index released by Staffing Industry Analysts suggests moderate breadth of year-over-year revenue growth in the US temporary staffing industry.

The index indicates the net percent of temporary staffing firms that reported positive revenue growth in SIA’s pulse survey. The SIA Staffing Index is a diffusion index with possible values ranging from -100 to 100; index values above zero imply revenue expansion in the overall industry.

The SIA Staffing Index was 37 in December, down slightly from the reading of 43 in November. In December, 68% of firms reported revenue growth while 31% indicated a decline.

“The SIA staffing index shows a consistent growth in temporary staffing with the index staying above 30 all through 2018,” said Senior Research Analyst Sree Thiyagarajan.

Over the past decade, the index has moved from negative values in 2009 to a pattern of growth during the economic expansion. 

The full report is available online. SIA will be publishing more staffing indices this year tracking trends in bill rates, new orders and unfilled orders.