-61.54% is the change from 819 to 315
Calculation steps:
[( 315 - 819 ) ÷ 819] x 100 = -61.54%
Formula
Percentage change = [(315 - 819) / 819] x 100
Subtract the new number by the original number
315 - 819 = -504
-504 ÷ 819 = -0.6153846153846154
-0.6153846153846154 x 100 = -61.54%