Apple’s Mac share of personal computers worldwide fell to a five-year low in December, mimicking the company’s own numbers that have portrayed a four-quarter sales slowdown.

According to web analytics vendor Net Applications, Apple’s desktop and notebook operating system—formerly OS X, now macOS—powered just 6.1 percent of all personal computers last month, down from 7 percent a year ago and a peak of 9.6 percent as recently as April 2016.

Net Applications measures operating system user share—an estimate of the proportion of all personal computer owners who run a device powered by a specific OS—by counting systems whose browsers reach websites of its clients.

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