Which year was mandal commission implemented?

1980. This is WRONG. 1980 was the year it was submitted. It was implemented only in 1994 or 1995. V.P. Singh announced its implementation on August 7, 1990, but there were furious protests, followed by a stay order from the court. The stay order was vacated and the court upheld the report - adding some caveats such as the exclusion of the 'creamy layer' - some years later.