Year Identification

Hi,I have a small(15 foot) boat with a Yamaha 90 hp two stroke engine.I would really like to know what year the engine is(last owner didn't know).The engine is fine,but the tilt motor will not go down,can hear the solenoid clicking when raising the engine but nothing happens when attempting to lower the engine.
It would help me greatly if I knew the year of manufacture of engine.The only information I can get of engine is off a small plate on transom mounting bracket,which is:Yamaha 90AETO-6H1-UL850173.
Any information or comments would be most welcome,cheers,Ian.

[boats.net]

I don't have much information on motors sold outside the USA but it's probably about a 1995 motor.

Many thanks for reply,Ian.