-69.86% is the change from 511 to 154
Calculation steps:
[( 154 - 511 ) ÷ 511] x 100 = -69.86%
Formula
Percentage change = [(154 - 511) / 511] x 100
Subtract the new number by the original number
154 - 511 = -357
-357 ÷ 511 = -0.6986301369863014
-0.6986301369863014 x 100 = -69.86%