-68.21% is the change from 821 to 261
Calculation steps:
[( 261 - 821 ) ÷ 821] x 100 = -68.21%
Formula
Percentage change = [(261 - 821) / 821] x 100
Subtract the new number by the original number
261 - 821 = -560
-560 ÷ 821 = -0.682095006090134
-0.682095006090134 x 100 = -68.21%