-83.8% is the change from 821 to 133
Calculation steps:
[( 133 - 821 ) ÷ 821] x 100 = -83.8%
Formula
Percentage change = [(133 - 821) / 821] x 100
Subtract the new number by the original number
133 - 821 = -688
-688 ÷ 821 = -0.8380024360535931
-0.8380024360535931 x 100 = -83.8%