-74.63% is the change from 339 to 86
Calculation steps:
[( 86 - 339 ) ÷ 339] x 100 = -74.63%
Formula
Percentage change = [(86 - 339) / 339] x 100
Subtract the new number by the original number
86 - 339 = -253
-253 ÷ 339 = -0.7463126843657817
-0.7463126843657817 x 100 = -74.63%