The numbers don't work that way unfortunately, unless I am missing something. I do not think we can take a total lifetime attach rate per console sold and divide that by year. I am mucking around with the PS2's numbers to come up with an average monthly attach rate right now.
-edit-
PS2 figures:
1520000000 game sales / 150000000 console sales = 10.13 games per console sold
150000000 console sales / 131 months = 1145038.1679389312977099236641221 consoles per month
1520000000 game sales / 131 months = 11603053.435114503816793893129771 games per month
11603053.44 games per month / 1145038.17 consoles per month = 10.13 games per console sold
10.13 games per console sold * 1145038.17 = 11603053.44 games per month
- edit - edit-
So, unless I have made a mistake or don't know the equation (happens a plenty), there is no way to derive useful yearly numbers from lifetime sales.
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