-6.84% is the change from 921 to 858
Calculation steps:
[( 858 - 921 ) ÷ 921] x 100 = -6.84%
Formula
Percentage change = [(858 - 921) / 921] x 100
Subtract the new number by the original number
858 - 921 = -63
-63 ÷ 921 = -0.06840390879478828
-0.06840390879478828 x 100 = -6.84%