I think it would be best for you to report donations made in calendar year 2019 in the forthcoming 2020 EA Survey (that will ask about 2019 donations) and for this year enter 0
Just to clarify: you can mention the donations you have already made in 2019 in the “In 2019, how much do you currently plan to donate?” box (along with any other donations you plan to make). Then if you didn’t make any donations in 2018 as a result, you can write ‘0’ in the “In 2018, roughly how much money did you donate?” box, and then mention bunching in the open comment.
Just to clarify: you can mention the donations you have already made in 2019 in the “In 2019, how much do you currently plan to donate?” box (along with any other donations you plan to make). Then if you didn’t make any donations in 2018 as a result, you can write ‘0’ in the “In 2018, roughly how much money did you donate?” box, and then mention bunching in the open comment.
(^David runs the survey in case that isn’t clear. I approve this message.)