Shondee Corporation uses the lower of cost or market and FIFO inventory methods. At the end of 2018, the FIFO cost of the ending inventory was $181,000, and the market value of the inventory was $160,000. The corporation switched to LIFO in 2019. If required, round your answer to the nearest dollar. As a result, Shondee Corporation must add: $ ______blank_____

to income for each of the years 2019, 2020, and 2021.