-91.34% is the change from 647 to 56
Calculation steps:
[( 56 - 647 ) ÷ 647] x 100 = -91.34%
Formula
Percentage change = [(56 - 647) / 647] x 100
Subtract the new number by the original number
56 - 647 = -591
-591 ÷ 647 = -0.9134466769706336
-0.9134466769706336 x 100 = -91.34%