-67.26% is the change from 507 to 166
Calculation steps:
[( 166 - 507 ) ÷ 507] x 100 = -67.26%
Formula
Percentage change = [(166 - 507) / 507] x 100
Subtract the new number by the original number
166 - 507 = -341
-341 ÷ 507 = -0.6725838264299803
-0.6725838264299803 x 100 = -67.26%