Washington - In celebration of its 40-year anniversary, OSHA on Feb. 15 posted a timeline of the agency's history. Ihe Occupational Safety and Health Act went into effect April 28, 1971. Since then, workplace fatalities have decreased approximately 65 percent even though employment has almost doubled, according to OSHA. The rate of reported serious workplace injuries and illnesses also has fallen from 11 per 100 workers in 1972 to 3.6 per 100 workers in 2009.
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