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:
| Location | Year | Champion | Runner-up | Score |
| --- | --- | --- | --- | --- |
| Lakeway | 1977.0 | Harold Solomon | Ken Rosewall | 7–6, 6–2, 2–6, 0–6, 6–3 |
| Las Vegas | 1978.0 | Björn Borg | Vitas Gerulaitis | 6–5, 5–6, 6–4, 6–5 |
| Dorado Beach | 1979.0 | Jimmy Connors | Vitas Gerulaitis | 6–5, 6–0, 6–4 |
| Forest Hills | 1980.0 | Vitas Gerulaitis | John McEnroe | 2–6, 6–2, 6–0 |
| Forest Hills | 1981.0 | Eddie Dibbs | Carlos Kirmayr | 6–3, 6–2 |
| Forest Hills | 1982.0 | Ivan Lendl | Eddie Dibbs | 6–1, 6–1 |
| Forest Hills | 1983.0 | John McEnroe | Vitas Gerulaitis | 6–3, 7–5 |
| Forest Hills | 1984.0 | John McEnroe | Ivan Lendl | 6–4, 6–2 |
| Forest Hills | 1985.0 | Ivan Lendl | John McEnroe | 6–3, 6–3 |
| Forest Hills | 1986.0 | Yannick Noah | Guillermo Vilas | 7–6, 6–0 |
| Forest Hills | 1987.0 | Andrés Gómez | Yannick Noah | 6–4, 7–6, 7–6 |
| Forest Hills | 1988.0 | Andre Agassi | Slobodan Živojinović | 7–5, 7–6, 7–5 |
| Forest Hills | 1989.0 | Ivan Lendl | Jaime Yzaga | 6–2, 6–1 |
| Forest Hills | 1990.0 | Ivan Lendl | Aaron Krickstein | 6–4, 6–7, 6–3 |
Question:
When was the earliest year that Guillermo Vilas was the runner-up?
Answer:
1986.0