| Value | Category | Cases | |
|---|---|---|---|
| 1 | Upper limit on income | 165 |
13.8%
|
| 2 | Lower limit on income | 347 |
28.9%
|
| 3 | Limit differences | 126 |
10.5%
|
| 4 | Don't know | 542 |
45.2%
|
| 99 | N/R | 19 |
1.6%
|
| 999 | N/A | 0 |
0%
|