Mars Perseverance rover spending by fiscal year. Amounts after the current year are official projections. The project began formulation in 2013 and entered the implementation (build) phase in 2016. The completed rover left the Jet Propulsion Laboratory in February 2020 for launch in July. Source: Planetary Science Budget Dataset, compiled by Casey Dreier for The Planetary Society (accessible on Google Sheets or downloadable as an Excel file).