-73.93% is the change from 840 to 219
Calculation steps:
[( 219 - 840 ) ÷ 840] x 100 = -73.93%
Formula
Percentage change = [(219 - 840) / 840] x 100
Subtract the new number by the original number
219 - 840 = -621
-621 ÷ 840 = -0.7392857142857143
-0.7392857142857143 x 100 = -73.93%