-86.8% is the change from 621 to 82
Calculation steps:
[( 82 - 621 ) ÷ 621] x 100 = -86.8%
Formula
Percentage change = [(82 - 621) / 621] x 100
Subtract the new number by the original number
82 - 621 = -539
-539 ÷ 621 = -0.8679549114331723
-0.8679549114331723 x 100 = -86.8%