| Characteristic | 2012 | 2013 | 2014 | 2015 | 2016* |
|---|---|---|---|---|---|
| - | - | - | - | - | - |
| - | - | - | - | - | - |
| - | - | - | - | - | - |
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Region
United States
Survey time period
2011 to 2016
Supplementary notes
Figures for 2012-2014 were added from previous editions of the report and may not have been be restated.
* No data was given about the total number and the number of private companies.
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