| Attempt by Year | Certification | Recertification | ||
|---|---|---|---|---|
| Pass Rate (%) | Mean Scaled Score | Pass Rate (%) | Mean Scaled Score | |
| First attempt* | ||||
| 2012 | 89.2 | 482 | 80.7 | 480 |
| 2011 | 89.5 | 486 | 81.5 | 485 |
| 2010 | 89.6 | 485 | 85.1 | 497 |
| 2009 | 91.0 | 496 | 89.2 | 524 |
| 2008 | 88.2 | 480 | 89.7 | 529 |
| Repeat attempt† | ||||
| 2012 | 48.4 | 380 | 41.0 | 367 |
| 2011 | 46.4 | 376 | 36.4 | 351 |
| 2010 | 39.7 | 368 | 38.0 | 365 |
| 2009 | 58.4 | 395 | 42.5 | 378 |
| 2008 | 47.6 | 378 | 42.0 | 368 |
↵* First attempt refers to candidates who did not fail their previous attempt. This includes first-time candidates as well as candidates for recertification who did not fail their last examination.
↵† Repeat attempt refers to candidates who are retaking the examination because they failed their last attempt.