-66.54% is the change from 511 to 171
Calculation steps:
[( 171 - 511 ) ÷ 511] x 100 = -66.54%
Formula
Percentage change = [(171 - 511) / 511] x 100
Subtract the new number by the original number
171 - 511 = -340
-340 ÷ 511 = -0.6653620352250489
-0.6653620352250489 x 100 = -66.54%