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:
| Week | Date | Opponent | Result | Record | Game Site | Attendance |
| --- | --- | --- | --- | --- | --- | --- |
| 1.0 | September 10, 1989 | at Miami Dolphins | W 27–24 | 1–0 | Joe Robbie Stadium | 54541.0 |
| 2.0 | September 18, 1989 | Denver Broncos | L 14–28 | 1–1 | Rich Stadium | 78176.0 |
| 3.0 | September 24, 1989 | at Houston Oilers | W 47–41 | 2–1 | Houston Astrodome | 57278.0 |
| 4.0 | October 1, 1989 | New England Patriots | W 31–10 | 3–1 | Rich Stadium | 78921.0 |
| 5.0 | October 8, 1989 | at Indianapolis Colts | L 14–37 | 3–2 | Hoosier Dome | 58890.0 |
| 6.0 | October 16, 1989 | Los Angeles Rams | W 23–20 | 4–2 | Rich Stadium | 76231.0 |
| 7.0 | October 22, 1989 | New York Jets | W 34–3 | 5–2 | Rich Stadium | 76811.0 |
| 8.0 | October 29, 1989 | Miami Dolphins | W 31–17 | 6–2 | Rich Stadium | 80208.0 |
| 9.0 | November 5, 1989 | at Atlanta Falcons | L 28–30 | 6–3 | Atlanta-Fulton County Stadium | 45267.0 |
| 10.0 | November 12, 1989 | Indianapolis Colts | W 30–7 | 7–3 | Rich Stadium | 79256.0 |
| 11.0 | November 19, 1989 | at New England Patriots | L 24–33 | 7–4 | Sullivan Stadium | 49663.0 |
| 12.0 | November 26, 1989 | Cincinnati Bengals | W 24–7 | 8–4 | Rich Stadium | 80074.0 |
| 13.0 | December 4, 1989 | at Seattle Seahawks | L 16–17 | 8–5 | Kingdome | 57682.0 |
| 14.0 | December 10, 1989 | New Orleans Saints | L 19–22 | 8–6 | Rich Stadium | 70037.0 |
| 15.0 | December 17, 1989 | at San Francisco 49ers | L 10–21 | 8–7 | Candlestick Park | 60927.0 |
| 16.0 | December 23, 1989 | at New York Jets | W 37–0 | 9–7 | The Meadowlands | 21148.0 |
Question:
When did they play at Candlestick Park?
Answer:
December 17, 1989