What year 9.9 outboard

[<Stevie J>]

I just bought a used Yamaha outboard motor. The manufacturers tag said Yamaha 15ESG
Code 684C
Can anyone tell me what year it is.I want to get a service manual. The motor hood cover has 9.9 HP. on it.
THANKS

[<boats.net>]

You have a 1988 15HP short shaft electric start motor