-74.61% is the change from 831 to 211
Calculation steps:
[( 211 - 831 ) ÷ 831] x 100 = -74.61%
Formula
Percentage change = [(211 - 831) / 831] x 100
Subtract the new number by the original number
211 - 831 = -620
-620 ÷ 831 = -0.7460890493381468
-0.7460890493381468 x 100 = -74.61%