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 | Driver | Constructor | Location | Report |
| --- | --- | --- | --- | --- |
| 1992 | Nigel Mansell | Williams-Renault | Hermanos Rodriguez | Report |
| 1991 | Riccardo Patrese | Williams-Renault | Hermanos Rodriguez | Report |
| 1990 | Alain Prost | Ferrari | Hermanos Rodriguez | Report |
| 1989 | Ayrton Senna | McLaren-Honda | Hermanos Rodriguez | Report |
| 1988 | Alain Prost | McLaren-Honda | Hermanos Rodriguez | Report |
| 1987 | Nigel Mansell | Williams-Honda | Hermanos Rodriguez | Report |
| 1986 | Gerhard Berger | Benetton-BMW | Hermanos Rodriguez | Report |
| 1985\n-\n1971 | Not held | Not held | Not held | Not held |
| 1970 | Jacky Ickx | Ferrari | Magdalena Mixhuca | Report |
| 1969 | Denny Hulme | McLaren-Ford | Magdalena Mixhuca | Report |
| 1968 | Graham Hill | Lotus-Ford | Magdalena Mixhuca | Report |
| 1967 | Jim Clark | Lotus-Ford | Magdalena Mixhuca | Report |
| 1966 | John Surtees | Cooper-Maserati | Magdalena Mixhuca | Report |
| 1965 | Richie Ginther | Honda | Magdalena Mixhuca | Report |
| 1964 | Dan Gurney | Brabham-Climax | Magdalena Mixhuca | Report |
| 1963 | Jim Clark | Lotus-Climax | Magdalena Mixhuca | Report |
| 1962 | Trevor Taylor\n Jim Clark | Lotus-Climax | Magdalena Mixhuca | Report |
Question:
what is the total number of years the event was not held?
Answer:
14