-39.29% is the change from 84 to 51
Calculation steps:
[( 51 - 84 ) ÷ 84] x 100 = -39.29%
Formula
Percentage change = [(51 - 84) / 84] x 100
Subtract the new number by the original number
51 - 84 = -33
-33 ÷ 84 = -0.39285714285714285
-0.39285714285714285 x 100 = -39.29%