-69.35% is the change from 819 to 251
Calculation steps:
[( 251 - 819 ) ÷ 819] x 100 = -69.35%
Formula
Percentage change = [(251 - 819) / 819] x 100
Subtract the new number by the original number
251 - 819 = -568
-568 ÷ 819 = -0.6935286935286935
-0.6935286935286935 x 100 = -69.35%