| Characteristic | Drivers in thousands |
|---|---|
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
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Source
Release date
March 2019
Region
United States
Survey time period
2013 to 2018
Special properties
figures as of May of each year.
Supplementary notes
Figures prior to 2018 were taken from previous editions.
Figures have been rounded
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