-77.22% is the change from 821 to 187
Calculation steps:
[( 187 - 821 ) ÷ 821] x 100 = -77.22%
Formula
Percentage change = [(187 - 821) / 821] x 100
Subtract the new number by the original number
187 - 821 = -634
-634 ÷ 821 = -0.7722289890377588
-0.7722289890377588 x 100 = -77.22%