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:
| Date of release | Title | Label | Oricon peak | RIAA cert. |
| --- | --- | --- | --- | --- |
| 1989.0 | Skid Row | Atlantic | 5.0 | 5x platinum |
| 1991.0 | Slave to the Grind | Atlantic | 3.0 | 2x platinum |
| 1995.0 | Subhuman Race | Atlantic | 6.0 | Gold |
| 2003.0 | Thickskin | Skid Row Recs | 111.0 | None |
| 2006.0 | Revolutions per Minute | SPV | 266.0 | None |
Question:
WHAT IS THE AVERAGE DATE OF RELEASE FOR THICKSKIN?
Answer:
2003.0