| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| how many serial killers were never caught | 0.99 | 0.3 | 120 | 56 |
| how many serial killers have been caught | 1.11 | 0.9 | 9003 | 32 |
| how many serial killers have there been | 1.58 | 0.3 | 5900 | 45 |
| serial killers never caught list | 1.47 | 0.1 | 9663 | 30 |
| how many uncaught serial killers are there | 1.06 | 0.2 | 9964 | 24 |
| how many serial killers are there today | 0.75 | 1 | 8556 | 9 |
| how many unsolved serial killers are there | 1.45 | 0.3 | 366 | 78 |
| how many serial killers in history | 0.27 | 0.4 | 4881 | 29 |
| never caught serial killers | 1.37 | 0.6 | 7578 | 86 |
| how many current serial killers are there | 0.54 | 0.5 | 2337 | 67 |
| number of serial killers | 0.09 | 0.1 | 6887 | 87 |
| total number of serial killers | 1.95 | 0.5 | 7092 | 62 |
| serial killers number of victims | 1.97 | 0.1 | 9230 | 60 |
