U.S. online job ads edged down by 18,900 in May to a total of about 4.9 million, according to The Conference Board’s report on online jobs ads released today. The decrease follows a gain of 28,900 job ads in April.

Last month’s supply/demand rate fell below two for the first time in just over six years as there were fewer than two unemployed for every vacancy.

"That is good news for many workers since the April supply/demand rate is a broad indication of current employer demand for labor,"said June Shelp, vice president at The Conference Board. "Unfortunately, it’s not all good news since overall employer demand has been flat for over a year and we’re seeing a drop in demand for high-paying jobs like computer workers and medical professionals.”

At the same time, in service/manufacturing occupations like production, building and grounds, food service and construction, there were close to four or even more unemployed workers for every opening.