@Sheena13
The list of reservations has a filter option for previous years. Then you can download (export) it to CSV file. I tried in for 2016, it worked, but you first need to list them all first for whole year, before exporting it .It contains booked nights
Same for transaction History, choose time period and download CSV file.
Unfortunately the section "earnings" in menu "performance" does show earnings and graph for years before year 2018, but is not listing booked/unbooked nights (they are set to zero).