-80.25% is the change from 81 to 16
Calculation steps:
[( 16 - 81 ) ÷ 81] x 100 = -80.25%
Formula
Percentage change = [(16 - 81) / 81] x 100
Subtract the new number by the original number
16 - 81 = -65
-65 ÷ 81 = -0.8024691358024691
-0.8024691358024691 x 100 = -80.25%