-87.7% is the change from 512 to 63
Calculation steps:
[( 63 - 512 ) ÷ 512] x 100 = -87.7%
Formula
Percentage change = [(63 - 512) / 512] x 100
Subtract the new number by the original number
63 - 512 = -449
-449 ÷ 512 = -0.876953125
-0.876953125 x 100 = -87.7%