Employees may file a petition for decertification (RD) if they believe support for a union has diminished, after collecting signatures from at least 30% of workers in a unit. A majority of votes decides the outcome.
| Petitions Filed | Elections | Won by Union | Lost by Union | Petitions Dismissed | Petitions Withdrawn | |
|---|---|---|---|---|---|---|
| FY09 | 568 | 270 | 111 | 159 | 88 | 235 |
| FY10 | 530 | 233 | 90 | 143 | 43 | 238 |
| FY11 | 500 | 271 | 122 | 149 | 52 | 193 |
| FY12 | 472 | 233 | 98 | 135 | 52 | 206 |
| FY13 | 472 | 202 | 79 | 123 | 49 | 181 |
| FY14 | 410 | 178 | 63 | 123 | 49 | 183 |
| FY15 | 407 | 178 | 76 | 106 | 55 | 180 |
| FY16 | 313 | 174 | 69 | 108 | 37 | 122 |
| FY17 | 328 | 168 | 59 | 118 | 27 | 125 |
| FY18 | 337 | 159 | 50 | 109 | 30 | 111 |