Another way to look at the data is that Mac users are buying Macs and Mac is not growing market share. This isn't surprising as the notebook/desktop market is

Another way to look at the data is that Mac users are buying Macs and Mac is not growing market share. This isn't surprising as the notebook/desktop market is mature and people are unlikely to switch platforms. So as long as Apple doesn't completely botch an update/upgrade, they will likely continue to sell about the same number each year.