A frequency count of the 12,761 occupations listed in the DOT shows the following startling data about the date (year) that each DOT description was last updated.
| DLU | N | % |
| 77 | 10288 | 80.6% |
| 78 | 355 | 2.8% |
| 79 | 102 | 0.8% |
| 80 | 151 | 1.2% |
| 81 | 239 | 1.9% |
| 82 | 26 | 0.2% |
| 83 | 2 | 0.0% |
| 84 | 2 | 0.0% |
| 85 | 2 | 0.0% |
| 86 | 770 | 6.0% |
| 87 | 154 | 1.2% |
| 88 | 259 | 2.0% |
| 89 | 283 | 2.2% |
| 90 | 106 | 0.8% |
| 91 | 1 | 0.0% |
| 93 | 21 | 0.2% |
