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The meaning of the frequency value in rosbags

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Dear all, i downloaded a rosbag from the internet and looked at the info of this file: path: ../raw/Vehicle1_velodyne_pos.bag version: 2.0 duration: 36:10s (2170s) start: Aug 12 2015 09:22:18.17 (1439364138.17) end: Aug 12 2015 09:58:28.86 (1439366308.86) size: 23.0 MB messages: 152840 compression: none [29/29 chunks] types: tf/tfMessage [94810edda583a504dfda3829e70d7eec] topics: tf 152840 msgs @ 99.2 Hz : tf/tfMessage As you can see, the topic __tf__ have 152840 messages and after that there is the number 99.2 Hz. I computed: (end_time - start_time) / number of messages and i got ca. 70 Hz. What is the meaning of the number 99.2 Hz?

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