-66.42% is the change from 819 to 275
Calculation steps:
[( 275 - 819 ) ÷ 819] x 100 = -66.42%
Formula
Percentage change = [(275 - 819) / 819] x 100
Subtract the new number by the original number
275 - 819 = -544
-544 ÷ 819 = -0.6642246642246642
-0.6642246642246642 x 100 = -66.42%