-77.62% is the change from 831 to 186
Calculation steps:
[( 186 - 831 ) ÷ 831] x 100 = -77.62%
Formula
Percentage change = [(186 - 831) / 831] x 100
Subtract the new number by the original number
186 - 831 = -645
-645 ÷ 831 = -0.776173285198556
-0.776173285198556 x 100 = -77.62%