-73.53% is the change from 831 to 220
Calculation steps:
[( 220 - 831 ) ÷ 831] x 100 = -73.53%
Formula
Percentage change = [(220 - 831) / 831] x 100
Subtract the new number by the original number
220 - 831 = -611
-611 ÷ 831 = -0.7352587244283996
-0.7352587244283996 x 100 = -73.53%