We've discussed this trend before, but Apple keeps doing it, so we have to keep revisiting the topic. You see, there is often a pretty blatant disconnect between the data that Apple chooses to show during its events and the data that would more accurately describe what is happening. Of course, Apple isn't the only company to do this, every company deals in various types of data spinning...
Source: http://www.phonearena.com/news/Apples-Cumulative-iPhone-Sales-chart-is-spinning-data-hard_id47332
Source: http://www.phonearena.com/news/Apples-Cumulative-iPhone-Sales-chart-is-spinning-data-hard_id47332