-74.85% is the change from 831 to 209
Calculation steps:
[( 209 - 831 ) ÷ 831] x 100 = -74.85%
Formula
Percentage change = [(209 - 831) / 831] x 100
Subtract the new number by the original number
209 - 831 = -622
-622 ÷ 831 = -0.7484957882069796
-0.7484957882069796 x 100 = -74.85%