-91.94% is the change from 819 to 66
Calculation steps:
[( 66 - 819 ) ÷ 819] x 100 = -91.94%
Formula
Percentage change = [(66 - 819) / 819] x 100
Subtract the new number by the original number
66 - 819 = -753
-753 ÷ 819 = -0.9194139194139194
-0.9194139194139194 x 100 = -91.94%