-50.9% is the change from 277 to 136
Calculation steps:
[( 136 - 277 ) ÷ 277] x 100 = -50.9%
Formula
Percentage change = [(136 - 277) / 277] x 100
Subtract the new number by the original number
136 - 277 = -141
-141 ÷ 277 = -0.5090252707581228
-0.5090252707581228 x 100 = -50.9%