Demise
The championship was cancelled following the 1989 season as manufacturers and teams chose to concentrate solely on the World Championship rather than risking equipment and drivers for a national series. Porsche withdrew immediately after their 1987 championship, while Sauber left the series after failing to win the teams championship in 1988. Although fields of twenty cars were still seen in the final year, there was a lack of interest in a 1990 season, the series was folded.
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