Don't get to hung-up on the year of the manual as that's more of an indication of when the manual was made not necessarily the year for your engine. The engine serial number range is more important to follow.
The service manual part number for your engine model started off as 90-830234R 2 but has been superseded twice after that. Part numbers 90-830234R 3 & 90-830234R 4. Any of the three will work.
If you want online free than you'll only be able to find/use the R 3 # in A.D's link above. If you want a book, you'll have to buy one from a dealer or online...There's a few on eBay, just run the three part numbers there to see photos of them.