Most mid school bike serials don't tell you when they were made
On Hoffman's for example, you can tell by the design of the frame if it was se built (92-93) ramp room built (94-96) or made in Taiwan (96 onwards
Your Taj will either be a ramp room or Taiwan built
If ramp room the down tube gusset will have no stamp, if Taiwan made it will be stamped HB
There's plenty on this in the big daddy thread
http://www.radbmx.co.uk/forum/index.php'topic=103085.0