Table 2.
Number of new and accumulated devices by year.
| Devices | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | Unknown |
| New | 3 | 7 | 30 | 87 | 121 | 120 | 38 | 17 |
| Accumulated | 3 | 10 | 40 | 127 | 248 | 368 | 406 | 423 |
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