-83.7% is the change from 503 to 82
Calculation steps:
[( 82 - 503 ) ÷ 503] x 100 = -83.7%
Formula
Percentage change = [(82 - 503) / 503] x 100
Subtract the new number by the original number
82 - 503 = -421
-421 ÷ 503 = -0.8369781312127237
-0.8369781312127237 x 100 = -83.7%