-77.47% is the change from 821 to 185
Calculation steps:
[( 185 - 821 ) ÷ 821] x 100 = -77.47%
Formula
Percentage change = [(185 - 821) / 821] x 100
Subtract the new number by the original number
185 - 821 = -636
-636 ÷ 821 = -0.7746650426309378
-0.7746650426309378 x 100 = -77.47%