The Conference Board’s Employment Trends Index increased again in April, after improving in March. The index rose to a reading of 108.08 in April, up from a downwardly revised reading of 107.37 in March.

“In recent months, the Employment Trends Index continued to improve, signaling that employment growth will remain solid through the summer,” said Gad Levanon, chief economist, North America, at The Conference Board. “With the economy growing well above trend, and the working-age population barely growing at all, we expect the labor market to significantly tighten in the coming year. At 3.9%, the unemployment rate is historically low, and we expect it to be around 3.5% a year from now.”

April’s increase in the index was fueled by positive contributions from seven out of the eight components; the percentage of firms with positions they are not able to fill right now made a neutral contribution.