The fire that killed dozens of people inside a locked poultry slaughterhouse in China on Monday has renewed calls for improving the often appalling conditions for workers in the world's second largest economy. A small protest — quickly dispersed by authorities — broke out in front of the charred shell of the plant, and relatives of the victims demanded that plant managers answer for the disaster.

Labor experts said the tragedy reflected a long history of safety problems in Chinese factories. "Throughout China's modern economic development, there has really been very little consideration for the rights and interests of the workers," said Li Qiang, executive director of New York-based China Labor Watch. A numerical look at China's deadly industrial record:

Workers killed in China by workplace accidents last year — roughly 200 per day. That's down from 75,572 in 2011 and 79,552 in 2010.

People killed in Monday's fire, making it the most deadly factory fire in China's history. Many were trapped inside the plant because doors they could have used to escape were bolted shut.

Workers injured in the fire

Minutes it took for the flames to race through the plant after an explosion started the blaze

Workers killed in a fire at a toy factory 20 years ago — China's second most deadly factory fire ever. Doors at that factory were locked, too, allegedly to prevent theft.

Miners killed in a 2008 mining cave-in

Industrial fires in the five days before Monday's disaster. Two people died in the earlier blazes.

Residents killed in a 2010 high-rise apartment building fire caused by a welder working for an illegal subcontractor. Gao Weizhong, director of the local construction committee, was later jailed on abuse of power and bribery charges.

Workers killed in explosions of combustible dust at two Apple suppliers in 2011. Another 59 people were injured.

230 million
People in the migrant workforce, which moves to cities from the countryside, supplying much of the cheap labor fueling China's economic boom

Official estimate of China's cases of pneumoconiosis, a respiratory illness often caused by prolonged exposure to dust that builds up in the lungs, making it painful to breathe. "You can delay the progress of the disease through certain drugs and treatments, but... it is basically a death sentence," says Geoff Crothall, spokesman for the Hong Kong-based advocacy group China Labor Bulletin.

Percentage of those cases believed to be work-related. Many of the afflicted people worked at construction sites in boomtowns such as Shenzhen, where they inhaled dust while drilling or blasting holes at construction sites.

6 million
Top estimate of actual number of pneumoconiosis cases in China

11,000 to 21,000
Compensation (in dollars, equal to 70,000 to 130,000 yuan) some Shenzhen victims received after staging sit-ins that provoked public sympathy for ailing construction workers

10 to 20
Estimated percentage of pneumoconiosis victims nationwide who qualify for any kind of payout

Percentage drop in fatalities in China's coal mining industry last year after the most dangerous small operations were shut down, and mines remaining open got better safety equipment.

Sources: Agence France Presse, The Economist, NPR, Wall Street Journal