Eric Miller/Reuters
A Dallas Cowboys fan wears a giant helmet before the Cowboys play the Minnesota Vikings in their NFL Divisional playoff football game in Minneapolis, Minnesota, January 17, 2010.
Economists anticipate the gauge slipped to 15.0 after posting a reading of 15.5 in December.
The measure has held above zero, a sign of expansion, for two straight months after not registering a reading above the level since December 2014.