-58.02% is the change from 81 to 34
Calculation steps:
[( 34 - 81 ) ÷ 81] x 100 = -58.02%
Formula
Percentage change = [(34 - 81) / 81] x 100
Subtract the new number by the original number
34 - 81 = -47
-47 ÷ 81 = -0.5802469135802469
-0.5802469135802469 x 100 = -58.02%