Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Year | Title | Peak chart positions\nAUS | Peak chart positions\nNZ | Peak chart positions\nUK | Album |
| --- | --- | --- | --- | --- | --- |
| 1981 | "Stand Up" | - | — | - | Triffids Sixth |
| 1982 | "Spanish Blue" | — | — | — | Single-only release |
| 1984 | "Beautiful Waste" | — | — | — | Single-only release |
| 1985 | "You Don't Miss Your Water" | — | — | — | Single-only release |
| 1986 | "Wide Open Road" | 64 | — | 26 | Born Sandy Devotional |
| 1987 | "Bury Me Deep in Love" | 48 | 34 | — | Calenture |
| 1988 | "Trick of the Light" | 77 | — | 73 | Calenture |
| 1988 | "Holy Water" | — | — | — | Calenture |
| 1989 | "Goodbye Little Boy" | 81 | — | — | The Black Swan |
| 1989 | "Falling Over You" | — | — | — | The Black Swan |
| 2007 | "Save What You Can" | — | — | — | Promotional release |
Question:
how many tracks were single-only releases?
Answer:
3