-92.11% is the change from 266 to 21
Calculation steps:
[( 21 - 266 ) ÷ 266] x 100 = -92.11%
Formula
Percentage change = [(21 - 266) / 266] x 100
Subtract the new number by the original number
21 - 266 = -245
-245 ÷ 266 = -0.9210526315789473
-0.9210526315789473 x 100 = -92.11%