-90.22% is the change from 849 to 83
Calculation steps:
[( 83 - 849 ) ÷ 849] x 100 = -90.22%
Formula
Percentage change = [(83 - 849) / 849] x 100
Subtract the new number by the original number
83 - 849 = -766
-766 ÷ 849 = -0.9022379269729093
-0.9022379269729093 x 100 = -90.22%