aquaz: If you really have those work experience then its your responsibility to gather those info. Consult w/ your previous employer and get those records. Also If you are reflecting those info you have to provide supporting documents. Hence, have a work experience letter accordingly too.

In general: BS + 2-4 / MS + 1-2).
Hence, you can provide the required info for filing the Labor. You dont need to dig all the way down to 10 years. 

Other helpful thread for you:
http://sajha.com/sajha/html/index.cfm?threadid=97438

I have also posted some info which you might be interested on.

~GoodLuck and Don't panic