-76.21% is the change from 517 to 123
Calculation steps:
[( 123 - 517 ) ÷ 517] x 100 = -76.21%
Formula
Percentage change = [(123 - 517) / 517] x 100
Subtract the new number by the original number
123 - 517 = -394
-394 ÷ 517 = -0.7620889748549323
-0.7620889748549323 x 100 = -76.21%