-50.39% is the change from 387 to 192
Calculation steps:
[( 192 - 387 ) ÷ 387] x 100 = -50.39%
Formula
Percentage change = [(192 - 387) / 387] x 100
Subtract the new number by the original number
192 - 387 = -195
-195 ÷ 387 = -0.5038759689922481
-0.5038759689922481 x 100 = -50.39%