-67.58% is the change from 512 to 166
Calculation steps:
[( 166 - 512 ) ÷ 512] x 100 = -67.58%
Formula
Percentage change = [(166 - 512) / 512] x 100
Subtract the new number by the original number
166 - 512 = -346
-346 ÷ 512 = -0.67578125
-0.67578125 x 100 = -67.58%