Work-related Fatalities Declined in 2011

Finally some good news from The Bureau of Labor Statistics-- There was a decline in worker-related fatal accidents in the American job force comparing the years 2011 and 2010.  In 2010, 4,690 workers lost their lives due to various accidents and incidents.  In 2011, the number was 4,609.  But even one death is one too many, particularly because we know that most of these incidents are preventable, assuming the employers are motivated to spend the time and money to prevent them.

One question that occurred to me is why the drop in number?  I wonder if it's because of the high unemployment rate, i.e., when there's less people working, there are less work injuries.