The ADR analysis said donations from corporates to national parties increased by 160 per cent between financial years 2004-05 to 2011-12 and financial years 2016-17 to 2017-18.

Between financial years 2012-13 and 2017-18, the BJP received the maximum corporate donations of Rs 1,621.40 crore, constituting 83.49 per cent of the total corporate donations in six years. The ADR analysis said donations from corporates to national parties increased by 160 per cent between financial years 2004-05 to 2011-12 and financial years 2016-17 to 2017-18.

Between financial years 2012-13 and 2017-18, donations from corporates to national parties increased by 414 per cent, with a major drop in the percentage of corporate donations in financial year 2015-16. Donations from corporates to national parties reduced by 25.07 per cent between financial year 2016-17 and 2017-18.

The political parties considered for the report were Bharatiya Janata Party (BJP), Congress, Nationalist Congress Party (NCP), Communist Party of India (CPI), CPM and All India Trinamool Congress (AITC).

Though a national party, BSP was not considered for analysis in this report as the party has declared that it received no voluntary contributions above Rs 20,000 from any donor during this period as well as during the time period since 2004, the report said. The report said CPI had the lowest share of corporate donations at two per cent.