-83.2% is the change from 518 to 87
Calculation steps:
[( 87 - 518 ) ÷ 518] x 100 = -83.2%
Formula
Percentage change = [(87 - 518) / 518] x 100
Subtract the new number by the original number
87 - 518 = -431
-431 ÷ 518 = -0.832046332046332
-0.832046332046332 x 100 = -83.2%