Sky Render on 23 July 2008
Market share is easy to calculate. You add together all values, then divide the total number of systems a single system sold by the total number of systems sold for that generation. This will give you a decimal number that's below 1 (or possibly exactly 1, but that would mean that you had only 1 data point). Just move the decimal place back 2 digits and there you go. That's your percentage.
I'll calculate one for you now:
Total market: 140 + 24 + 22 + 11 = 197
Dreamcast: 11 / 197 = 0.05583 (5.58%)
Sky Render - Sanity is for the weak.
