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) |
| --- | --- | --- | --- | --- | --- |
| 1985.0 | June 24 | Whitney Houston | Album | Gold | Won |
| 1985.0 | August 26 | Whitney Houston | Album | Platinum | Won |
| 1985.0 | November 1 | Whitney Houston | Album | 2× Multi-Platinum | Won |
| 1986.0 | February 14 | Whitney Houston | Album | 3× Multi-Platinum | Won |
| 1986.0 | March 24 | Whitney Houston | Album | 4× Multi-Platinum | Won |
| 1986.0 | May 1 | Whitney Houston | Album | 5× Multi-Platinum | Won |
| 1986.0 | June 12 | Whitney Houston | Album | 6× Multi-Platinum | Won |
| 1986.0 | September 18 | Whitney Houston | Album | 7× Multi-Platinum | Won |
| 1987.0 | February 24 | Whitney Houston | Album | 8× Multi-Platinum | Won |
| 1988.0 | October 6 | Whitney Houston | Album | 9× Multi-Platinum | Won |
| 1994.0 | January 25 | Whitney Houston | Album | 10× Multi-Platinum | Won |
| 1994.0 | November 29 | Whitney Houston | Album | 11× Multi-Platinum | Won |
| 1995.0 | April 5 | Whitney Houston | Album | 12× Multi-Platinum | Won |
| 1995.0 | December 6 | "You Give Good Love" | Single | Gold | Won |
| 1995.0 | December 6 | "Saving All My Love for You" | Single | Gold | Won |
| 1995.0 | December 6 | "How Will I Know" | Single | Gold | Won |
| 1995.0 | December 6 | "Greatest Love of All" | Single | Gold | Won |
| 1999.0 | January 15 | Whitney Houston | Album | Diamond | Won |
| 1999.0 | July 29 | Whitney Houston | Album | 13× Multi-Platinum | Won |
Question:
Which is the average year with the date of February 24?
Answer:
1987.0