-0.36% is the change from 824 to 821
Calculation steps:
[( 821 - 824 ) ÷ 824] x 100 = -0.36%
Formula
Percentage change = [(821 - 824) / 824] x 100
Subtract the new number by the original number
821 - 824 = -3
-3 ÷ 824 = -0.0036407766990291263
-0.0036407766990291263 x 100 = -0.36%