West Bengal Chief Minister Mamata Banerjee on Wednesday wondered whether demonetisation was enforced to allow some black money holders to quietly convert their money into white after the RBI said almost all junked notes have returned to banks.

Banerjee, who had criticised the BJP-led central government for demonetising a bulk of currency in November 2016, said the RBI report vindicated TMC's fears on demonetisation.

In a post on Facebook, she said she now wanted to know where the blackmoney has gone?

The RBI said on Wednesday that banks received 99.3 per cent of the Rs 15.41 lakh crore in junked Rs 500 and Rs 1,000 notes in circulation on November 8, 2016, when the note ban was announced.

"Today, the RBI in its annual report for 2017-18 has vindicated our apprehension. 99.3% of the money has come back to the banking system. My first question now is where has the black money gone? My second question, is this scheme hatched to allow some black money holders to quietly convert their black money into white?" she said in a Facebook post.

Soon after Prime Minister Narendra Modi announced demonetisation of currency in a live telecast to the nation, Banerjee said she had an "intuition" that it was a "big anti-people move".

"It will severely affect the common people of the country, especially, farmers, unorganized sector, small entrepreneurs and hard-working middle class," Banerjee said.

"What a tragedy and what a shame," she said.

Almost all the 500 and 1,000 currency notes that were made illegal in November 2016 have returned to the banking system, the RBI said today, prompting the opposition to question the efficacy of demonetisation in curbing blackmoney.