When did the disinvestment started in India?

When did the disinvestment started in India?
In 1999.

The Department of Disinvestment was set up as a separate department on 10thDecember,1999 and was later renamed as Ministry of Disinvestment from 6thSeptember,2001. From 27th May, 2004, the Department of Disinvestment is one of the Departments under the Ministry of Finance.

-Rohit