I'm looking for the same info. I will probably have to go to Reservations, filter > 1/1/2018-12/31/2018, download the results, import into a spreadsheet, and total it, but I don't think it is quite accurate. When I did it for 2019 (before I found the earnings summary) the sum did not equal the amount on the earnings summary... It's close, but a little higher than the amount the summary shows.