The FY2017 President's Budget Request for NASA contains a lot of interesting data regarding how NASA intends to spend money in the future. It also contains fascinating data regarding how money was spent in the past. By combing through this and previous years' budget requests (and a few other public sources), we can reconstruct NASA's actual amounts spent on planetary science programs and missions.

Well, we did just that and have published the data to be used by anyone. You can view it online via Google Docs, or download the entire file as an Excel Spreadsheet.