@boomerang,
Maybe it's the time of year - is Google time sensitive? - but when I typed "how many people a year are injured by", guess what word Google added to finish my question for me?
Yup, you got it. A little data. The first must be a typo or they forgot to add some zeros.
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http://www.statisticbrain.com/firework-statistics/
Firework Industry Statistics Data
Pounds of fireworks purchased each year in the US 213.2 lbs
Annual fireworks industry revenue $940 million
Firework Injury Statistics Data
Number of injuries per 100 lbs of Fireworks used 3.5
Number of deaths in the US annually due to fireworks 4
Number of serious injuries in the US each year by fireworks 9,300
Percent of injuries caused by illegal fireworks 40 %
Percent of injuries incurred by kids under the age of 14 45 %
Number of Americans who lose sight in one or both eyes due to fireworks 400
Number of US fires caused each year due to fireworks 20,000
Percent of all US fire dollar loss caused by fireworks 0.1%
...
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