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:
| Edition | Round | Date | Surface | Opponent | Result |
| --- | --- | --- | --- | --- | --- |
| 1983 World Group I | R1 | July 17, 1983 | Clay | Christiane Jolissaint | 4–6, 6–4, 4–6 |
| 1983 World Group I | PO | July 19, 1983 | Clay | Angela Longo | 6–1, 6–0 |
| 1983 World Group I | PO | July 21, 1983 | Clay | Olga Zaitseva | 6–0, 6–3 |
| 1984 World Group I | R1 | July 15, 1984 | Clay | Jo Durie | 6–4, 4–6, 6–4 |
| 1984 World Group I | R2 | July 16, 1984 | Clay | Natasha Reva | 6–2, 6–0 |
| 1984 World Group I | QF | July 18, 1984 | Clay | Mima Jaušovec | 3–6, 6–3, 6–1 |
| 1985 World Group I | R1 | October 6, 1985 | Hard | Larisa Savchenko | 6–7 (3–7) , 6–4, 6–1 |
| 1985 World Group I | R2 | October 8, 1985 | Hard | Sabrina Goleš | 6–1, 6–3 |
| 1985 World Group I | QF | October 10, 1985 | Hard | Annabel Croft | 6–2, 6–2 |
| 1985 World Group I | SF | October 12, 1985 | Hard | Hana Mandlíková | 6–3, 2–6, 1–6 |
| 1986 World Group I | R1 | July 20, 1986 | Clay | Larisa Savchenko | 6–2, 6–1 |
| 1986 World Group I | R2 | July 21, 1986 | Clay | Catherine Tanvier | 6–0, 6–1 |
| 1986 World Group I | QF | July 23, 1986 | Clay | Claudia Kohde-Kilsch | 6–4, 6–2 |
| 1987 World Group I | R1 | July 26, 1987 | Hard | Angelika Kanellopoulou | 6–0, 6–0 |
| 1987 World Group I | R2 | July 27, 1987 | Hard | Yayuk Basuki | 6–4, 6–0 |
| 1987 World Group I | QF | July 29, 1987 | Hard | Elizabeth Smylie | 6–4, 6–4 |
| 1987 World Group I | SF | July 31, 1987 | Hard | Chris Evert | 2–6, 6–2, 4–6 |
| 1989 World Group I | R1 | October 1, 1989 | Hard | Kim Il-soon | 6–1, 6–0 |
| 1989 World Group I | R2 | October 3, 1989 | Hard | Mercedes Paz | 4–6, 6–1, 6–3 |
| 1989 World Group I | QF | October 5, 1989 | Hard | Anne Minter | 3–6, 6–2, 4–6 |
| ↓Representing [[&#124;]]↓ | ↓Representing [[&#124;]]↓ | ↓Representing [[&#124;]]↓ | ↓Representing [[&#124;]]↓ | ↓Representing [[&#124;]]↓ | ↓Representing [[&#124;]]↓ |
| 1991 World Group I | R1 | July 23, 1991 | Hard | Mercedes Paz | 6–0, 7–6 (7–5) |
| 1991 World Group I | R2 | July 24, 1991 | Hard | Li Fang | 6–7 (5–7) , 7–5, 6–2 |
| 1991 World Group I | QF | July 25, 1991 | Hard | Jana Novotná | 4–6, 4–6 |
| 1992 World Group I | R1 | July 14, 1992 | Clay | Catarina Lindqvist | 6–0, 6–2 |
| 1992 World Group I | PO | July 16, 1992 | Clay | Anna Smashnova | 6–1, 6–0 |
| 1992 World Group I | PO | July 17, 1992 | Clay | Rossana de los Ríos | 6–2, 6–2 |
Question:
On July 15, 1984 what surface was used?
Answer:
Clay