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 | Date | Title | Format(s) | Award description(s) | Result(s) |
| --- | --- | --- | --- | --- | --- |
| 1990.0 | November 27 | "I'm Your Baby Tonight" | Single | Gold | Won |
| 1991.0 | January 15 | I'm Your Baby Tonight | Album | Gold | Won |
| 1991.0 | January 15 | I'm Your Baby Tonight | Album | Platinum | Won |
| 1991.0 | January 15 | I'm Your Baby Tonight | Album | 2× Multi-Platinum | Won |
| 1991.0 | March 21 | "All the Man That I Need" | Single | Gold | Won |
| 1991.0 | May 2 | I'm Your Baby Tonight | Album | 3× Multi-Platinum | Won |
| 1995.0 | April 5 | I'm Your Baby Tonight | Album | 4× Multi-Platinum | Won |
Question:
What is the average year with an award of platinum?
Answer:
1991.0