-50.75% is the change from 266 to 131
Calculation steps:
[( 131 - 266 ) ÷ 266] x 100 = -50.75%
Formula
Percentage change = [(131 - 266) / 266] x 100
Subtract the new number by the original number
131 - 266 = -135
-135 ÷ 266 = -0.5075187969924813
-0.5075187969924813 x 100 = -50.75%