-83.5% is the change from 497 to 82
Calculation steps:
[( 82 - 497 ) ÷ 497] x 100 = -83.5%
Formula
Percentage change = [(82 - 497) / 497] x 100
Subtract the new number by the original number
82 - 497 = -415
-415 ÷ 497 = -0.8350100603621731
-0.8350100603621731 x 100 = -83.5%