the fall 1991 bureau of broadcast measurement ratings were a defining moment for the station, as it found itself in first place in montreal with over a million listeners in full coverage. it was the first time that an fm station finished in first place in the fall ratings, which are the most important for the radio industry as they are used to determine prices charged for advertising. ckoi-fm would have over a million listeners in 32 consecutive books (excluding summer ratings starting in 2001 which were only done for the central area of the market), from fall 1991 to fall 2002 inclusively. (the station had already managed to get a million listeners on a few occasions during summer ratings before 1991.) the station's best-ever results under the old diary system were obtained in the spring 1995 ratings, in which ckoi-fm got 1,341,300 listeners. by comparison, 730 ckac, which was had been montreal's usual #1 station, had 775,500 listeners.