-60.59% is the change from 647 to 255
Calculation steps:
[( 255 - 647 ) ÷ 647] x 100 = -60.59%
Formula
Percentage change = [(255 - 647) / 647] x 100
Subtract the new number by the original number
255 - 647 = -392
-392 ÷ 647 = -0.6058732612055642
-0.6058732612055642 x 100 = -60.59%