Want to know how market share will be in 2014? The analysts answer

[theRepublic]

Ok, enough with the jokes. Here are a couple of real questions:

1. I assume the Y-axis is percent market share. I suppose the X-axis is time, but what are the units?

2. How did you decide what type of regression to use for each console? Two of the lines look logarithmic, while one looks linear. Although the data may have just been as such to flatten out that logarithmic trend line.