-82.01% is the change from 339 to 61
Calculation steps:
[( 61 - 339 ) ÷ 339] x 100 = -82.01%
Formula
Percentage change = [(61 - 339) / 339] x 100
Subtract the new number by the original number
61 - 339 = -278
-278 ÷ 339 = -0.8200589970501475
-0.8200589970501475 x 100 = -82.01%