-77.11% is the change from 83 to 19
Calculation steps:
[( 19 - 83 ) ÷ 83] x 100 = -77.11%
Formula
Percentage change = [(19 - 83) / 83] x 100
Subtract the new number by the original number
19 - 83 = -64
-64 ÷ 83 = -0.7710843373493976
-0.7710843373493976 x 100 = -77.11%