According to data made available in response to an RTI query, in the months of July, August, September and October last year, metro sold an average of 15,650 cards per day.
This year, during the same period, the figure dropped to 12,250.
Though one can assume that a gradual dip in smart card sales would be natural as more and more people switch to them, statistics show that the percentage share of smart card users increased only marginally over last year - from 69.94 per cent in October 2016 to 70.84 per cent in October 2017.
The Delhi Metro Rail Corporation (DMRC), however, maintained that irrespective of variations in sales, smart card users have increased. It also identified new rules which made smart cards non-refundable from April as one of the factors behind the drop.
The daily average of smart card sales in July, August, September and October in 2016 were 16,000, 16,500, 15,200 and 14,900. The figures recorded during the corresponding months this year are 12,900, 12,400, 11,700 and 12,000.
"It is seen from the above figures that smart card sales variation per day is in the range of 3,000 to 4,000 approximately and this much fluctuation is normal for any given month. These numbers don't hold any significance to number of smart card users which are over 70 per cent (18-20 lakh) of the total ridership at present," DMRC said in a statement.
The percentage of smart card users, however, was 69.04, 70.12, 71.90 and 69.94 in the months of July, August, September and October 2016 respectively.
In 2017, during the aforementioned months, the share of smart card users was 72.17, 72.47, 72.65 and 70.84.
Metro hiked its fares twice -- in May and October - this year. Following the second round of hike, it lost three lakh commuters per day in October.
DMRC and the Centre said that the fall in ridership could not be solely attributed to the fare hike and factors such as an extra Sunday, Diwali and Chhath Puja may also have been responsible and also defended the hike saying it was essential for the company's "efficiency".
The current fare structure is: up to 2 km -- Rs 10, 2 to 5 km -- Rs 20, 5 to 12 km -- Rs 30, 12 to 21 km -- Rs 40, 21 to 32 km -- Rs 50 and for journeys beyond 32 km -- Rs 60.