-66.73% is the change from 517 to 172
Calculation steps:
[( 172 - 517 ) ÷ 517] x 100 = -66.73%
Formula
Percentage change = [(172 - 517) / 517] x 100
Subtract the new number by the original number
172 - 517 = -345
-345 ÷ 517 = -0.6673114119922631
-0.6673114119922631 x 100 = -66.73%