-77.38% is the change from 831 to 188
Calculation steps:
[( 188 - 831 ) ÷ 831] x 100 = -77.38%
Formula
Percentage change = [(188 - 831) / 831] x 100
Subtract the new number by the original number
188 - 831 = -643
-643 ÷ 831 = -0.7737665463297232
-0.7737665463297232 x 100 = -77.38%