-69.8% is the change from 831 to 251
Calculation steps:
[( 251 - 831 ) ÷ 831] x 100 = -69.8%
Formula
Percentage change = [(251 - 831) / 831] x 100
Subtract the new number by the original number
251 - 831 = -580
-580 ÷ 831 = -0.6979542719614922
-0.6979542719614922 x 100 = -69.8%