| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't Know (Spontaneous) | 25 |
22.5%
|
| 1 | Standard for total energy use | 46 |
41.4%
|
| 2 | Standard for energy use relative to output | 16 |
14.4%
|
| 3 | Standard for energy use relative to other parameters | 24 |
21.6%
|
| Sysmiss | 298 |