When the Macintosh was launched in 1984, computers running the MS-DOS operating system were nearing a dominant position in the market. Having launched in 1981 as the IBM PC, they were quickly cloned and four years later “PCs” were selling at the rate of two million a year. The Mac only managed 372,000 units in its first year.
In other words, PC was outselling the Mac by a factor of nearly six. It turned out to be a high point. The ratio by which the PC outsold the Mac only increased from there.