-95.49% is the change from 266 to 12
Calculation steps:
[( 12 - 266 ) ÷ 266] x 100 = -95.49%
Formula
Percentage change = [(12 - 266) / 266] x 100
Subtract the new number by the original number
12 - 266 = -254
-254 ÷ 266 = -0.9548872180451128
-0.9548872180451128 x 100 = -95.49%