US online job ads rose by 83,700 in July to approximately 5.38 million, according to The Conference Board’s report on online job ads released today. July’s increase follows a loss of 144,300 job ads in June but leaves the year so far with a moderate increase.

“Demand has flattened over the past five months, with alternating monthly increases followed by decreases,” said Gad Levanon, managing director, macroeconomic and labor market research for The Conference Board. “Overall, 2015 has shown moderate gains averaging about 38,000 per month, largely due to the very strong January and February increases.”

In July, five of the largest online job categories posted increases while four posted decreases and one — installation, maintenance, and repair — remained constant.

The office and administrative support category posted the largest increase, up 31,600 in July to a total of 611,800 due to rises in demand in bookkeeping, accounting, and auditing clerks and executive secretaries and executive administrative assistants. Transportation and material moving ads increased by 14,200 to 408,500. Food preparation and serving-related ads gained 10,700 to 241,100 due to gains in first-line supervisors of food preparation and serving workers and combined food preparation and serving workers, including fast food.

Construction and extraction ads fell by 3,200 to 133,400 due to drops in demand for first-line supervisors of construction trades and extraction workers, and also construction laborers.