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:
| Year | Entrant | Chassis | Engine | Points |
| --- | --- | --- | --- | --- |
| 1986.0 | Osella Squadra Corse | Osella FA1G | Alfa Romeo V8 | 0.0 |
| 1987.0 | Osella Squadra Corse | Osella FA1I | Alfa Romeo V8 | 0.0 |
| 1987.0 | Osella Squadra Corse | Osella FA1G | Alfa Romeo V8 | 0.0 |
| 1988.0 | Scuderia Italia | Dallara 3087 | Cosworth V8 | 0.0 |
| 1988.0 | Scuderia Italia | Dallara 188 | Cosworth V8 | 0.0 |
| 1989.0 | Scuderia Italia | Dallara 189 | Cosworth V8 | 4.0 |
| 1990.0 | Footwork Arrows Racing | Arrows A11B | Cosworth V8 | 2.0 |
| 1991.0 | Footwork Grand Prix International | Footwork A11C | Porsche V12 | 0.0 |
| 1991.0 | Footwork Grand Prix International | Footwork FA12 | Porsche V12 | 0.0 |
| 1991.0 | Footwork Grand Prix International | Footwork FA12C | Cosworth V8 | 0.0 |
| 1992.0 | Andrea Moda Formula | Coloni C4B | Judd V10 | 0.0 |
| 1992.0 | Andrea Moda Formula | Moda S921 | Judd V10 | 0.0 |
Question:
What is the sum of points in 1991, for footwork a11c chassis?
Answer:
0.0