Sony, Nintendo, Microsoft - 1981 to 2011 gaming division profits chart

[DevilRising]

What was the point of having the chart go all the way back to 1981, if Sony and MS didn't even having real gaming divisions until 95 and 2001, respectively? Although, MS did have some Windows games before that, and Sony used to have Sony Imagesoft, which mainly made NES and SNES games.