To determine your newest donors, please log into your Donors page. On this page, you'll be able to filter through your donor data, including the option to view how many donors have contributed once with the Number of Donations filter:
Alternatively, if you wish to view this data in a spreadsheet, you can also use our CSV tool to download the data. When viewing the form, please be sure to scroll to the right to view all columns. In the following example, it can be located under column "AM".