Sorry type error.
It should be 2012 , 2 decades and 20 years from 1992.
we also had lesser known but successful MDs like manoj Gyan, Abavaanan, Balabharathi, Devendran, Ramesh vinayagam, Sirpi who also had close to 20 movies each during their careers but much of their movies are part of the film box and have not seen the light of the day. all of the above guys did just tamil predominantly.
we had very few exceptions of Hamsalekhas, Raj-Kotis who did a few small budgeted and quickies for producers like V sekar, ram narayanan and others.