-61.21% is the change from 647 to 251
Calculation steps:
[( 251 - 647 ) ÷ 647] x 100 = -61.21%
Formula
Percentage change = [(251 - 647) / 647] x 100
Subtract the new number by the original number
251 - 647 = -396
-396 ÷ 647 = -0.6120556414219475
-0.6120556414219475 x 100 = -61.21%