-60.09% is the change from 644 to 257
Calculation steps:
[( 257 - 644 ) ÷ 644] x 100 = -60.09%
Formula
Percentage change = [(257 - 644) / 644] x 100
Subtract the new number by the original number
257 - 644 = -387
-387 ÷ 644 = -0.6009316770186336
-0.6009316770186336 x 100 = -60.09%