-7.17% is the change from 921 to 855
Calculation steps:
[( 855 - 921 ) ÷ 921] x 100 = -7.17%
Formula
Percentage change = [(855 - 921) / 921] x 100
Subtract the new number by the original number
855 - 921 = -66
-66 ÷ 921 = -0.07166123778501629
-0.07166123778501629 x 100 = -7.17%