-69.4% is the change from 817 to 250
Calculation steps:
[( 250 - 817 ) ÷ 817] x 100 = -69.4%
Formula
Percentage change = [(250 - 817) / 817] x 100
Subtract the new number by the original number
250 - 817 = -567
-567 ÷ 817 = -0.6940024479804161
-0.6940024479804161 x 100 = -69.4%