-96.62% is the change from 266 to 9
Calculation steps:
[( 9 - 266 ) ÷ 266] x 100 = -96.62%
Formula
Percentage change = [(9 - 266) / 266] x 100
Subtract the new number by the original number
9 - 266 = -257
-257 ÷ 266 = -0.9661654135338346
-0.9661654135338346 x 100 = -96.62%