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 | at/vs. | Opponent | Score | Attendance | Record |
| --- | --- | --- | --- | --- | --- | --- |
| 1.0 | January 14, 1989 | vs. | New England Blazers | 19 - 8 | 16269.0 | Win |
| 2.0 | January 21, 1989 | at | Baltimore Thunder | 14 - 13 | 6479.0 | Win |
| 3.0 | January 28, 1989 | at | New York Saints | 16 - 20 | 9324.0 | Loss |
| 4.0 | February 12, 1989 | vs. | Baltimore Thunder | 14 - 9 | 12220.0 | Win |
| 5.0 | February 18, 1989 | vs. | Detroit Turbos | 19 - 10 | 13932.0 | Win |
| 6.0 | February 24, 1989 | at | New England Blazers | 16 - 11 | 8107.0 | Win |
| 7.0 | March 4, 1989 | at | Detroit Turbos | 11 - 16 | 10637.0 | Loss |
| 8.0 | March 10, 1989 | vs. | Washington Wave | 13 - 9 | 16413.0 | Win |
Question:
Name the most attendance for number 4
Answer:
12220.0