-61.5% is the change from 839 to 323
Calculation steps:
[( 323 - 839 ) ÷ 839] x 100 = -61.5%
Formula
Percentage change = [(323 - 839) / 839] x 100
Subtract the new number by the original number
323 - 839 = -516
-516 ÷ 839 = -0.6150178784266984
-0.6150178784266984 x 100 = -61.5%