-82.9% is the change from 503 to 86
Calculation steps:
[( 86 - 503 ) ÷ 503] x 100 = -82.9%
Formula
Percentage change = [(86 - 503) / 503] x 100
Subtract the new number by the original number
86 - 503 = -417
-417 ÷ 503 = -0.8290258449304175
-0.8290258449304175 x 100 = -82.9%