Answer
$$1,650,000 \ games\ per \ year $$
Work Step by Step
The total number of games sold is given. In order to find an average given the total, it is necessary to divide by the change in time. In this case, the change in time in 6 years. Doing this, we find:
$$ =\frac{9,900,000}{6} = 1,650,000 \ games\ per \ year $$
