All that with having the microphone on the back of iMac.
In 2017 Mac sales increased to nearly 20 million (19,661 units shipped), according to the latest estimates shared by research firms IDC and Gartner.
The roughly 19.6 million total is based on Apple's reported Mac sales of 13.9 million units in the first three calendar quarters of the year, while IDC and Gartner estimate Apple sold another 5.4 million to 5.7 million Macs in the fourth quarter. We'll know exactly how many Macs were sold in 2017 when Apple reports its next earnings results on February 1.
Source: MacRumors.com https://www.macrumors.com/2018/01/12/apple-sold-around-20m-macs-in-2017/?utm_source=osx&utm_medium=push&utm_campaign=front