-72.1% is the change from 828 to 231
Calculation steps:
[( 231 - 828 ) ÷ 828] x 100 = -72.1%
Formula
Percentage change = [(231 - 828) / 828] x 100
Subtract the new number by the original number
231 - 828 = -597
-597 ÷ 828 = -0.7210144927536232
-0.7210144927536232 x 100 = -72.1%