While most U.S. workers feel secure in their jobs, their concern about the economy is growing, Spherion reported this week.

Only six percent of 3,137 employees surveyed last month said they felt the economy was getting stronger, down from 24 percent a year ago, according to the Fort Lauderdale, Fla.-based staffing firm. Despite the downturn, 78 percent of respondents said they were unlikely to lose their jobs in the year ahead, while about half said they were confident about their ability to find a new job.

"Clearly, there are lingering concerns about the economy and job market," Spherion President Roy Krause said in a statement. "The bright spot out of all of this is that workers have a much more positive outlook on their own employment prospects," he said.

According to a separate report by the Labor Department, job growth in February continued in health care and food services, but remained flat in manufacturing, construction and retail. About 63,000 workers lost their jobs in February, the report said.