自从一九六二年三月宣布“宇宙”计划以来,“宇宙”发射器作为回收——观察（侦察）类型的比例仍然稳定地保持在50％。到一九七O年七月发射“宇宙-350号”的日期为止,此比例为50.3％。由于飞行寿命的增长,到“字宙-400号” 发射时,它变为48.7％,而到一九七一年十一月二日发射“宇宙-453号”时,此比例变为47％。对统计观察的其它途径揭示,自从“宇宙-251号”发射以来,这些可回收卫星的一部分或大部分在轨道上的停留时问大约增大了68％。 Since the “cosmic” program was announced in March 1962, the percentage of “cosmic” launchers remained stable at 50% as a recovery-observation (reconnaissance) type. By the time of the launch of Cosmic-350 in July 1970, the ratio was 50.3%. Due to the increase of flight life, it became 48.7% when “Cosmos-400” was launched and 47% when Cosmos-453 was launched on November 2, . Other ways of looking at statistics revealed that, since the launch of Cosmic-251, some or most of these recoverable satellites have been on-orbit for about an increase of 68%.