-87.65% is the change from 510 to 63
Calculation steps:
[( 63 - 510 ) ÷ 510] x 100 = -87.65%
Formula
Percentage change = [(63 - 510) / 510] x 100
Subtract the new number by the original number
63 - 510 = -447
-447 ÷ 510 = -0.8764705882352941
-0.8764705882352941 x 100 = -87.65%