Knock on Wood by Amy Stewart first appeared on the Israeli foreign-music chart on 2 Apr 1979, entering at #38. It peaked at #3 on 21 May 1979. In total it spent 13 weeks on the chart, last charting on 25 Jun 1979. It also made the year-end chart: #35 of 1979.
| Wk | Date | Pos |
|---|---|---|
| 1 | 2 Apr 1979 | 38 |
| 2 | 9 Apr 1979 | 18 |
| 3 | 16 Apr 1979 | 13 |
| 4 | 23 Apr 1979 | 10 |
| 5 | 30 Apr 1979 | 5 |
| 6 | 7 May 1979 | 5 |
| 7 | 14 May 1979 | 4 |
| 8 | 21 May 1979 | 3 |
| 9 | 28 May 1979 | 8 |
| 10 | 4 Jun 1979 | 12 |
| 11 | 11 Jun 1979 | 16 |
| 12 | 18 Jun 1979 | 25 |
| 13 | 25 Jun 1979 | 34 |