-83.04% is the change from 507 to 86
Calculation steps:
[( 86 - 507 ) ÷ 507] x 100 = -83.04%
Formula
Percentage change = [(86 - 507) / 507] x 100
Subtract the new number by the original number
86 - 507 = -421
-421 ÷ 507 = -0.8303747534516766
-0.8303747534516766 x 100 = -83.04%