-72.75% is the change from 921 to 251
Calculation steps:
[( 251 - 921 ) ÷ 921] x 100 = -72.75%
Formula
Percentage change = [(251 - 921) / 921] x 100
Subtract the new number by the original number
251 - 921 = -670
-670 ÷ 921 = -0.7274701411509229
-0.7274701411509229 x 100 = -72.75%