-90.77% is the change from 921 to 85
Calculation steps:
[( 85 - 921 ) ÷ 921] x 100 = -90.77%
Formula
Percentage change = [(85 - 921) / 921] x 100
Subtract the new number by the original number
85 - 921 = -836
-836 ÷ 921 = -0.9077090119435396
-0.9077090119435396 x 100 = -90.77%