-95.21% is the change from 647 to 31
Calculation steps:
[( 31 - 647 ) ÷ 647] x 100 = -95.21%
Formula
Percentage change = [(31 - 647) / 647] x 100
Subtract the new number by the original number
31 - 647 = -616
-616 ÷ 647 = -0.9520865533230294
-0.9520865533230294 x 100 = -95.21%