| Code | Explanation | From | Through |
|---|---|---|---|
| A | SUMMARY LEVELS 1 AND 3. | 10/01/1996 | Present |
| B | SUMMARY LEVELS 1, 3, AND 5. | 10/01/1996 | Present |
| C | SUMMARY LEVELS 1, 3, AND 4. | 10/01/1996 | Present |
| D | SUMMARY LEVELS 1, 2, AND 3. | 10/01/1996 | Present |
| E | SUMMARY LEVELS 1, 3, 4, AND 5. | 10/01/1996 | Present |
| F | SUMMARY LEVELS 1, 2, 3, AND 5. | 10/01/1996 | Present |
| G | SUMMARY LEVELS 1, 2, 3, AND 4. | 10/01/1996 | Present |
| H | SUMMARY LEVELS 1, 2, 3, 4, AND 5. | 10/01/1996 | Present |
| Z | EXCLUSION | 08/01/2007 | Present |