Successful space launches include all military, commercial, and government launches that deliver a payload to the proper orbit and location.
NOTE: The three-month moving average is the average number of successful launches for the most recent month and two preceding months. Launches per month have been adjusted for a 30-day month. The actual number of launches during a month is multiplied by the ratio of 30 to the number of days in that month to yield the adjusted number of launches for that month.
|Successful Space Launches (three-month moving average)||Apr-01||Apr-02|
|United States of America||2.0||2.0|
|Percentage change from same month previous year||-1.16||0.64|
|Percentage change from same month previous year||-41.42||80.94|
SOURCE: National Aeronautics and Space Administration, National Space Science Data Center, Spacewarn monthly bulletins, available at http://nssdc.gsfc.nasa.gov/spacewarn/.