-91.33% is the change from 646 to 56
Calculation steps:
[( 56 - 646 ) ÷ 646] x 100 = -91.33%
Formula
Percentage change = [(56 - 646) / 646] x 100
Subtract the new number by the original number
56 - 646 = -590
-590 ÷ 646 = -0.913312693498452
-0.913312693498452 x 100 = -91.33%