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 | Event | Venue | Driver | Result |
| --- | --- | --- | --- | --- |
| 1975.0 | BRDC International Trophy | Silverstone | Wilson Fittipaldi | Ret |
| 1978.0 | BRDC International Trophy | Silverstone | Emerson Fittipaldi | 2 |
| 1979.0 | Gran Premio Dino Ferrari | Imola | Alex Ribeiro | Ret |
| 1980.0 | Spanish Grand Prix | Jarama | Emerson Fittipaldi | 5 |
| 1980.0 | Spanish Grand Prix | Jarama | Keke Rosberg | Ret |
| 1981.0 | South African Grand Prix | Kyalami | Keke Rosberg | 4 |
| 1981.0 | South African Grand Prix | Kyalami | Chico Serra | 9 |
Question:
How many years did Wilson Fittipaldi race?
Answer:
1.0