-66.27% is the change from 507 to 171
Calculation steps:
[( 171 - 507 ) ÷ 507] x 100 = -66.27%
Formula
Percentage change = [(171 - 507) / 507] x 100
Subtract the new number by the original number
171 - 507 = -336
-336 ÷ 507 = -0.6627218934911243
-0.6627218934911243 x 100 = -66.27%