-87.27% is the change from 644 to 82
Calculation steps:
[( 82 - 644 ) ÷ 644] x 100 = -87.27%
Formula
Percentage change = [(82 - 644) / 644] x 100
Subtract the new number by the original number
82 - 644 = -562
-562 ÷ 644 = -0.8726708074534162
-0.8726708074534162 x 100 = -87.27%