Disk Data transfer rate (Windows Rating) Gone down?

My Primary Hard disk which is my SSD

has gone down from 7.1 to 6.9..

any explanation for this?
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More about disk data transfer rate windows rating down
  1. The 0.2 drop is to small of a difference to be noticed with real-world use.

    All SSDs have slightly slower performance over time as they "settle in" and all of the fresh NAND gets used.

    To restore any SSD to fresh-out-of-the-box condition/performance you have to Secure Erase it.
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