-75.52% is the change from 339 to 83
Calculation steps:
[( 83 - 339 ) ÷ 339] x 100 = -75.52%
Formula
Percentage change = [(83 - 339) / 339] x 100
Subtract the new number by the original number
83 - 339 = -256
-256 ÷ 339 = -0.7551622418879056
-0.7551622418879056 x 100 = -75.52%