 Despite the loss of the Z28, Camaro sales remained steady for 1975 at 145,770 units.With the demise of the other pony cars the previous year, Camaro and Pontiac's Firebird were now the only traditional pony cars left on the market, giving GM 100 percent penetration of this segment for the first time ever.Also, despite General Motors' policy against factory-sponsored racing efforts, Camaro began to make a name for itself on the track on the new International Race of Champions (IROC) series with many top drivers winning trophies from behind the wheel of a Camaro year after year until the late 1980s.