-61.21% is the change from 812 to 315
Calculation steps:
[( 315 - 812 ) ÷ 812] x 100 = -61.21%
Formula
Percentage change = [(315 - 812) / 812] x 100
Subtract the new number by the original number
315 - 812 = -497
-497 ÷ 812 = -0.6120689655172413
-0.6120689655172413 x 100 = -61.21%