WASHINGTON (AP) — The number of workers who died on the job in the US fell by 17 percent last year to the lowest level in nearly two decades, as workers logged fewer hours during the recession, the Labor Department said yesterday.

The 4,340 workplace fatalities recorded in 2009 was the smallest total since the Bureau of Labor Statistics first began tracking the data in 1992. It's the second straight year that fatal work injuries have reached a historic low, following a 10 percent drop in 2008.

High unemployment and lay-offs in more dangerous industries like construction played a major role in the decrease, the agency said. The construction unemployment rate is 17.3 percent, nearly double the overall jobless rate of 9.5 percent.

Workers on average logged six percent fewer hours last year than in 2008. Employees in construction worked 17 percent fewer hours in 2009 than the previous year.

Labor Secretary Hilda Solis called the decrease encouraging and pledged to continue her agency's stepped-up enforcement of workplace safety laws.

"As the economy regains strength and more people re-enter the work force, the Department of Labor will remain vigilant to ensure America's workers are kept safe while they earn a paycheck," Solis said.

Workplace suicides declined by 10 percent to 237 after reaching a historic high in 2008. But that count is still the second-highest total recorded since the agency began tracking workplace deaths.

For the second straight year, commercial fishing was the deadliest occupation in the country, with a fatality rate about 60 times higher than the average rate for all workers.

One of the few sectors where the fatality rate increased was in building and grounds maintenance, where the number of deaths rose six percent.

The report is based on preliminary numbers. A final report is scheduled to be released next year.