The number of unemployed people per job opening hovered at record-low levels in February, a new sign of the difficulty employers face in hiring and retaining workers.

There were just 0.6 unemployed people per opening in February, according to data from the Bureau of Labor Statistics released on Tuesday. The number is lower than the previous record of 0.8, set just before the pandemic took hold, and much lower than the 4.9 unemployed people per opening at the outset of the pandemic.