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Difficult to gather sales figures for this particular segment of the industry as generator companies do not give out sales figures. The New York Times in 2013 reported from a study done that more than a million are sold per year with 90 percent of those for home use:
One of the latest reports that I was able to locate in terms of production can be found here:
I hope that some of this information can be helpful as I will go ahead and opt-out for other experts to possibly assist.