-61.9% is the change from 819 to 312
Calculation steps:
[( 312 - 819 ) ÷ 819] x 100 = -61.9%
Formula
Percentage change = [(312 - 819) / 819] x 100
Subtract the new number by the original number
312 - 819 = -507
-507 ÷ 819 = -0.6190476190476191
-0.6190476190476191 x 100 = -61.9%