-91.21% is the change from 637 to 56
Calculation steps:
[( 56 - 637 ) ÷ 637] x 100 = -91.21%
Formula
Percentage change = [(56 - 637) / 637] x 100
Subtract the new number by the original number
56 - 637 = -581
-581 ÷ 637 = -0.9120879120879121
-0.9120879120879121 x 100 = -91.21%