-83.6% is the change from 506 to 83
Calculation steps:
[( 83 - 506 ) ÷ 506] x 100 = -83.6%
Formula
Percentage change = [(83 - 506) / 506] x 100
Subtract the new number by the original number
83 - 506 = -423
-423 ÷ 506 = -0.8359683794466403
-0.8359683794466403 x 100 = -83.6%