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:
| Season | Cup FinalDate | WinningTeam | Score | LosingTeam | Cup Final Attendance |
| --- | --- | --- | --- | --- | --- |
| 1977 | 9 October 1977 | Brisbane City (1) | 1–1 (5-3 Penalties) | Marconi Stallions | 9,000 |
| 1978 | 8 October 1978 | Brisbane City (2) | 2–1 | Adelaide City | 6,964 |
| 1979 | 30 September 1979 | Adelaide City (1) | 3–1 | St George | 9,554 |
| 1980 | 5 October 1980 15 October 1980 | Marconi Stallions (1) | 0–0 (a.e.t.) 3–0 (Replay) | Heidelberg United | 7,000 5,000 |
| 1981 | 20 September 1981 | Brisbane Lions (1) | 3–1 | West Adelaide | 8,132 |
| 1982 | 12 September 1982 | APIA Leichhardt (2) | 2–1 | Heidelberg United | 7,000 |
| 1983 | 6 November 1983 13 November 1983 | Sydney Olympic (1) | 1–0 1–0 | Heidelberg United | 9,420 6,000 |
| 1984 | 13 September 1984 | Newcastle Rosebud United (1) | 1–0 | Melbourne Knights | 5,000 |
| 1985 | 11 August 1985 | Sydney Olympic (2) | 2–1 | Preston Lions | 11,187 |
| 1986 | 17 September 1986 | Sydney City (1) | 3–2 (a.e.t.) | West Adelaide | 5,200 |
| 1987 | 14 October 1987 18 October 1987 | Sydney United (1) | 1–0 1–0 | South Melbourne | 5,845 6,000 |
| 1988 | 14 August 1988 | APIA Leichhardt (2) | 0–0 (5-3 Penalties) | Brunswick Juventus | 5,200 |
| 1989 | 20 August 1989 | Adelaide City (2) | 2–0 | Sydney Olympic | 10,000 |
| 1989–90 | 25 April 1990 | South Melbourne (1) | 4–1 | Sydney Olympic | 7,000 |
| 1990–91 | 7 April 1991 | Parramatta Eagles (1) | 1–0 | Preston Lions | 8,749 |
| 1991–92 | 7 April 1992 | Adelaide City (3) | 2–1 | Marconi Stallions | 6,500 |
| 1992–93 | 18 April 1993 | Heidelberg United (1) | 2–0 | Parramatta Eagles | 4,596 |
| 1993–94 | 17 October 1993 | Parramatta Eagles (2) | 2–0 | Sydney United | 5,156 |
| 1994–95 | 16 October 1994 | Melbourne Knights (1) | 6–0 | Heidelberg United | 6,000 |
| 1995–96 | 27 January 1996 | South Melbourne (2) | 3–1 | Newcastle Breakers | 7,000 |
| 1996–97 | 6 October 1996 | Collingwood Warriors (1) | 1–0 | Marconi Stallions | 5,327 |
Question:
On what date did the Brisbane Lions (1) win?
Answer:
20 September 1981