-77.09% is the change from 921 to 211
Calculation steps:
[( 211 - 921 ) ÷ 921] x 100 = -77.09%
Formula
Percentage change = [(211 - 921) / 921] x 100
Subtract the new number by the original number
211 - 921 = -710
-710 ÷ 921 = -0.7709011943539631
-0.7709011943539631 x 100 = -77.09%