-69.43% is the change from 821 to 251
Calculation steps:
[( 251 - 821 ) ÷ 821] x 100 = -69.43%
Formula
Percentage change = [(251 - 821) / 821] x 100
Subtract the new number by the original number
251 - 821 = -570
-570 ÷ 821 = -0.6942752740560292
-0.6942752740560292 x 100 = -69.43%