-67.13% is the change from 505 to 166
Calculation steps:
[( 166 - 505 ) ÷ 505] x 100 = -67.13%
Formula
Percentage change = [(166 - 505) / 505] x 100
Subtract the new number by the original number
166 - 505 = -339
-339 ÷ 505 = -0.6712871287128713
-0.6712871287128713 x 100 = -67.13%