Statistics for NASA Mars Missions

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Launch Date	Probe Type	Mission Status	Answer	% Correct
November 2011	Rover	Ongoing	Mars Science Laboratory (Curiosity)	81%
July 2003	Rover	Ongoing	Mars Exploration Rover - Opportunity	69%
June 2003	Rover	Success	Mars Exploration Rover - Spirit	62%
August 1975	Lander/ Orbiter	Success	Viking 1	62%
September 1975	Lander/ Orbiter	Success	Viking 2	62%
November 1964	Flyby	Success	Mariner 4	56%
November 1964	Flyby	Failure	Mariner 3	50%
(launched on above mission)	Rover	Success	Sojourner	50%
December 1996	Lander	Success	Mars Pathfinder	48%
February 1969	Flyby	Success	Mariner 6	42%
March 1969	Flyby	Success	Mariner 7	42%
May 1971	Orbiter	Failure	Mariner 8	40%
May 1971	Orbiter	Success	Mariner 9	40%
March 2016 (delayed to May 2018)	Lander	Delayed	InSight	33%
August 2005	Orbiter	Ongoing	Mars Reconnaissance Orbiter	29%
August 2007	Lander	Success	Phoenix Mars Lander	27%
December 1998	Orbiter	Failure	Mars Climate Orbiter	23%
January 1999	Lander	Failure	Mars Polar Lander	23%
April 2001	Orbiter	Ongoing	2001 Mars Odyssey	21%
November 2013	Orbiter	Ongoing	Mars Atmosphere and Volatile Evolution (MAVEN)	19%
November 1996	Orbiter	Success	Mars Global Surveyor	15%
(launched on above mission)	Impact	Failure	Deep Space 2 Probes	12%
September 1992	Orbiter	Failure	Mars Observer	8%