-10.27% is the change from 915 to 821
Calculation steps:
[( 821 - 915 ) ÷ 915] x 100 = -10.27%
Formula
Percentage change = [(821 - 915) / 915] x 100
Subtract the new number by the original number
821 - 915 = -94
-94 ÷ 915 = -0.10273224043715846
-0.10273224043715846 x 100 = -10.27%