-39.63% is the change from 164 to 99
Calculation steps:
[( 99 - 164 ) ÷ 164] x 100 = -39.63%
Formula
Percentage change = [(99 - 164) / 164] x 100
Subtract the new number by the original number
99 - 164 = -65
-65 ÷ 164 = -0.39634146341463417
-0.39634146341463417 x 100 = -39.63%