-71.99% is the change from 921 to 258
Calculation steps:
[( 258 - 921 ) ÷ 921] x 100 = -71.99%
Formula
Percentage change = [(258 - 921) / 921] x 100
Subtract the new number by the original number
258 - 921 = -663
-663 ÷ 921 = -0.7198697068403909
-0.7198697068403909 x 100 = -71.99%