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    $\begingroup$ 100-Total[your_array_here,{2}] $\endgroup$ Commented May 26, 2020 at 4:45
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    $\begingroup$ @ciao: Very cute solution! Thanks. $\endgroup$ Commented May 26, 2020 at 5:08
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    $\begingroup$ @Garfield it is not just cute though: it is lightning-fast too! It is pretty much guaranteed to beat any Map based solution by orders of magnitude in execution time. Of course you could generalize it as Length[array] - Total[array, {2}]. $\endgroup$ Commented May 26, 2020 at 5:19