-21.43% is the change from 266 to 209
Calculation steps:
[( 209 - 266 ) ÷ 266] x 100 = -21.43%
Formula
Percentage change = [(209 - 266) / 266] x 100
Subtract the new number by the original number
209 - 266 = -57
-57 ÷ 266 = -0.21428571428571427
-0.21428571428571427 x 100 = -21.43%